djeedai / bevy_hanabi / 30813441935

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Add main camera and frustum kill (#556)

Add a new component `HanabiMainCamera` to tag the "main" view that
Hanabi uses for all single-camera features. This component must be added
to one camera only.

Augment the simulation parameters (`GpuSimParams`) with the world space
position of the main camera, and the equation of its 6 frustum planes.

Add a new `KillFrustumModifier` which marks all particles outside the
main camera frustum as dead. This prevents simulating particles which
left the screen (not visible anymore). However care must be taken with
moving cameras (e.g. player view) to not kill too aggressively,
otherwise the player might notice particles "disappearing". The modifier
allows a threshold distance to leave some margin around the frustum.

Changed `EvalContext::make_fn()` to add a new optional return token
emitted as the function's return type, if any.

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