Create a public vtkext module that can be used by both libf3d and plugins

[mwestphal]

This add a new vtkext module that can be used by both libf3d and plugins.
For now it contains only two classes but may be improved in the future.
It must depend only on itself and VTK, but the internal private VTK modules can depend on it.

This also split the sdk and the plugin_sdk in two cmake installation components as well as split the find_package results in multiple parts,

• application (f3d::f3d),
• library (f3d::libf3d and include_dir) and
• pluginsdk (f3d::vtkext and plugin macros)

This also fix a potential segfault when loading an invalid plugin.

Fix: #1115

Installation result:

[100%] Built target f3d
Install the project...
-- Install configuration: "Release"
-- Installing: /home/glow/dev/f3d/f3d/build/../install/lib/libvtkext.so
-- Set non-toolchain portion of runtime path of "../install/lib/libvtkext.so" to "$ORIGIN"
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/applications/f3d-plugin-native.desktop
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/thumbnailers/f3d-plugin-native.thumbnailer
-- Installing: /home/glow/dev/f3d/f3d/build/../install/share/f3d/plugins/native.json
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/applications/f3d-plugin-assimp.desktop
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/thumbnailers/f3d-plugin-assimp.thumbnailer
-- Installing: /home/glow/dev/f3d/f3d/build/../install/share/f3d/plugins/assimp.json
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/applications/f3d-plugin-exodus.desktop
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/thumbnailers/f3d-plugin-exodus.thumbnailer
-- Installing: /home/glow/dev/f3d/f3d/build/../install/share/f3d/plugins/exodus.json
-- Installing: /home/glow/dev/f3d/f3d/build/../install/lib/libf3d.so.2.3
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/libf3d.so.2
-- Set non-toolchain portion of runtime path of "../install/lib/libf3d.so.2.3" to "$ORIGIN"
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/libf3d.so
-- Installing: /home/glow/dev/f3d/f3d/build/../install/bin/f3d
-- Set non-toolchain portion of runtime path of "../install/bin/f3d" to "$ORIGIN/../lib"
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/applications/f3d.desktop
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/icons/hicolor/32x32/apps/f3d.png
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/icons/hicolor/48x48/apps/f3d.png
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/icons/hicolor/64x64/apps/f3d.png
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/icons/hicolor/scalable/apps/f3d.svg
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/bash-completion/completions/f3d
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/zsh/site-functions/_f3d
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/fish/vendor_completions.d/f3d.fish
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/metainfo/app.f3d.F3D.metainfo.xml
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/doc/F3D/LICENSE.md
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/share/doc/F3D/THIRD_PARTY_LICENSES.md
[glow@arch ~/dev/f3d/f3d/build]$ cmake --install . --component sdk
-- Install configuration: "Release"
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/reader.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/plugin.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/camera.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/engine.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/exception.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/export.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/image.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/interactor.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/loader.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/log.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/options.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/types.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/utils.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/window.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/f3dLibraryTargets.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/f3dLibraryTargets-release.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/f3dConfig.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/f3dConfigVersion.cmake
-- Installing: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/library-config.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/f3dEmbed.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/f3dTargets.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/f3dTargets-release.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/application-config.cmake
[glow@arch ~/dev/f3d/f3d/build]$ cmake --install . --component plugin_sdk
-- Install configuration: "Release"
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/vtkF3DFaceVaryingPointDispatcher.h
-- Installing: /home/glow/dev/f3d/f3d/build/../install/include/f3d/vtkF3DBitonicSort.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/vtkextModule.h
-- Installing: /home/glow/dev/f3d/f3d/build/../install/lib/vtk/hierarchy/f3d_vtkext/vtkext-hierarchy.txt
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d_vtkext/f3d_vtkext-targets.cmake
-- Installing: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d_vtkext/f3d_vtkext-targets-release.cmake
-- Installing: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d_vtkext/f3d_vtkext-vtk-module-properties.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/reader.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/include/f3d/plugin.h
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/plugin-config.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/f3dPlugin.cmake
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/plugin.cxx.in
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/plugin.desktop.in
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/plugin.thumbnailer.in
-- Up-to-date: /home/glow/dev/f3d/f3d/build/../install/lib/cmake/f3d/readerBoilerPlate.h.in

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 96.43%. Comparing base (f0ecafb) to head (4a86e88).

Files	Patch %	Lines
library/src/engine.cxx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1280      +/-   ##
==========================================
- Coverage   96.44%   96.43%   -0.02%     
==========================================
  Files         146      146              
  Lines        8715     8716       +1     
==========================================
  Hits         8405     8405              
- Misses        310      311       +1     

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[Meakk]

Some comments. Overall it looks very good :)