Make frame a seperate method of PointerTarget/PointerGrab

[ids1024]

Input handling in compositors will have to emit this appropriatly. But then other methods don't have to map perfectly to frames.

Meant to address #1126.

[Drakulix]

Looks in principle good to me. 👍

This obviously also needs updates to smallvil and possibly wlcs_anvil and some examples. Also an entry in the changelog.

[codecov-commenter]

Codecov Report

Patch coverage: 40.25% and project coverage change: +0.06% 🎉

Comparison is base (58d5bdc) 22.87% compared to head (4c37923) 22.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1137      +/-   ##
==========================================
+ Coverage   22.87%   22.93%   +0.06%     
==========================================
  Files         144      144              
  Lines       23317    23375      +58     
==========================================
+ Hits         5333     5362      +29     
- Misses      17984    18013      +29     

Flag	Coverage Δ
wlcs-buffer	19.84% <0.00%> (-0.05%)	⬇️
wlcs-core	19.49% <0.00%> (-0.05%)	⬇️
wlcs-output	8.25% <0.00%> (-0.03%)	⬇️
wlcs-pointer-input	21.73% <40.25%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
anvil/src/input_handler.rs	7.31% <0.00%> (-0.03%)	⬇️
anvil/src/shell/grabs.rs	0.00% <0.00%> (ø)
src/desktop/wayland/layer.rs	7.09% <0.00%> (-0.05%)	⬇️
src/desktop/wayland/popup/grab.rs	0.00% <0.00%> (ø)
src/input/mod.rs	50.60% <ø> (ø)
src/wayland/data_device/dnd_grab.rs	0.00% <0.00%> (ø)
src/wayland/data_device/server_dnd_grab.rs	0.00% <0.00%> (ø)
src/wayland/pointer_gestures.rs	0.00% <ø> (ø)
src/wayland/relative_pointer.rs	0.00% <ø> (ø)
wlcs_anvil/src/main_loop.rs	68.96% <27.27%> (-0.45%)	⬇️
... and 6 more

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