This PR adds `cargo fmt -- --check`, `nx lint ...` and `nx test ...` as
GitHub Actions. This will cause future PRs to automatically fail when
formatting issues, Clippy warnings, or test failures are present in the
changed code.
This PR implements basic object selection, with help from `bevy_mod_picking` and
`bevy_mod_outline`.
### Work Done
* Click to select objects in the world
* Selected objects become visually highlighted
* The selected entity is available globally on the `Res<Selection>` resource
* Selected entities can also be queried via the `Selected` marker component
* Pressing `F` will "focus" the camera on the selected entity
* Pressing `Esc` will clear the active selection
### Known Issues
* We're currently using `bevy_mod_picking`'s "Selection" feature, which isn't
aware of our own input events. As a consequence, it will select the object
under the cursor when releasing `LMB` after orbiting the camera, which is not
what we want. This should be pretty easily fixable by dropping
`bevy_mod_picking`'s selection feature and reading the object under the
cursor in our own click listener that only runs if the LMB event is
unhandled.
* The skinned mesh is not currently selectable. This is likely fixable by
adjusting the logic in `scene::mark_scene_objects`... somehow. The `Gltf`
data structure is kind of a nightmare to work with, so this will take some
investigation.
### Future Enhancements
* For parity with other DCC apps, the "Focus" action should also adjust the
camera zoom level to "frame" the selected object in the view. Punting on that
for now because I'm not super confident about the math involved.
* Group selection with Shift/Ctrl and/or marquee selection would be really nice
to have, but probably not critical for now.
### New `math` module
* Traits for error-tolerant floating-point comparisons
* Traits for interpolation and easing
* Bevy plugin to manage 3D interpolations with ECS components
### `skybox` module refactor
* ECS resource to enable external skybox selection/updates
* System run conditions for more idiomatic/ECS-friendly control flow
### Camera controller refactor
* Renamed from `orbit_cam` to `camera_controller`
* Now delegates to the new interpolation plugin for WASD motion smoothing
* Simple API for attaching the `CameraController` component to the camera from
another module -- this resolves an awkward separation-of-concerns situation
where we had to configure a bunch of render-quality settings in the camera
controller module
### Scene module refactor
* Renamed from `test_scene` to `scene`
* This module is now responsible for configuring the skybox
* This module is now responsible for spawning the camera and configuring the
render settings
Danny McGee