make collider header-only (#871)

* pch related changes

* weird error

* try fix error

* disable pch for msvc

* header-only collider

* fix

* fix format

* cmake changes

src/collider/CMakeLists.txt

@@ -14,16 +14,10 @@
 
 project (collider)
 
-file(GLOB_RECURSE SOURCE_FILES CONFIGURE_DEPENDS *.cpp)
-add_library(${PROJECT_NAME} OBJECT ${SOURCE_FILES})
-target_include_directories(${PROJECT_NAME} PUBLIC
+add_library(${PROJECT_NAME} INTERFACE)
+target_include_directories(${PROJECT_NAME} INTERFACE
     $<INSTALL_INTERFACE:include/${CMAKE_PROJECT_NAME}>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>)
-target_link_libraries(${PROJECT_NAME} PUBLIC utilities)
-target_compile_options(${PROJECT_NAME} PRIVATE ${MANIFOLD_FLAGS})
-
-target_compile_features(${PROJECT_NAME}
-    PUBLIC cxx_std_17
-)
-install(TARGETS ${PROJECT_NAME} EXPORT manifoldTargets)
-install(FILES include/collider.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${CMAKE_PROJECT_NAME})
+target_link_libraries(${PROJECT_NAME} INTERFACE utilities)
+target_compile_options(${PROJECT_NAME} INTERFACE ${MANIFOLD_FLAGS})
+target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_17)