Virtual UI panels

[guusw]

MVP for world space UI, tried to keep the PR as small as possible

• Added basic world space UI rendering and input.
• Added some basic documentation (reference/shards/VUI/Context/)

[codecov]

Codecov Report

Merging #525 (27c19ed) into devel (a76b227) will decrease coverage by 0.05%.
The diff coverage is 78.18%.

@@            Coverage Diff             @@
##            devel     #525      +/-   ##
==========================================
- Coverage   81.40%   81.36%   -0.05%     
==========================================
  Files         235      243       +8     
  Lines       29650    30152     +502     
==========================================
+ Hits        24138    24534     +396     
- Misses       5512     5618     +106     

Impacted Files	Coverage Δ
include/linalg_shim.hpp	91.11% <ø> (+8.88%)	⬆️
src/extra/gfx/shards_types.hpp	100.00% <ø> (ø)
src/gfx/checked_stack.hpp	66.66% <ø> (ø)
src/gfx/view_raycast.hpp	100.00% <ø> (ø)
src/input/input.hpp	92.59% <ø> (ø)
src/spatial/context.cpp	55.35% <55.35%> (ø)
src/spatial/panel.hpp	85.71% <85.71%> (ø)
src/extra/spatial/spatial.cpp	91.26% <91.26%> (ø)
src/gfx/egui/renderer.cpp	83.72% <93.93%> (+0.65%)	⬆️
src/core/exposed_type_utils.hpp	100.00% <100.00%> (ø)
... and 35 more

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[guusw]

Renamed to Spatial.UI & Panel

[Kryptos-FR]

I have an issue with right-clicking. For some reason it doesn't work in debug but does in release (even after removing the FreeCamera which was capturing it to move the view). I don't have an easy reproduction case right now, as it needs to create a shard with ui that responds to the right-click specifically, which we don't have any example at the moment.

// in UI's shard activate
let mouse = &ui.ctx().input().pointer;
if mouse.secondary_released() {
  // do something
  shlog!("right mouse clicked");
}

[guusw]

Yes thanks for reminding, I'll fix that @Kryptos-FR

EDIT: I thought you meant the same issue you mentioned earlier with left click being stuck when moving the camera but this it slightly different, but maybe the same cause.