djeedai / bevy_hanabi / 14180248739

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Color changes to allow random firework colors (#437)

Change a few things to allow the `firework.rs` example to get a random
color per firework explosion:

- Add `ColorBlendMode` and `ColorBlendMask` to enable color blending,
  and allow overlaying _e.g._ a `SetAttributeModifier(Attribute::COLOR)`
  with a `ColorOverLifetimeModifier`, without the former overwriting the
  latter. The blend mode determines the blend operation, while the blend
  mask determines which components are affected in the 4D vector.
- Add a new expression to combine a 3D vector and a scalar into a 4D
  vector. This allows recombining an RGB color with an Alpha value.
- Update a different PRNG seed each frame because the GPU doesn't retain
  the PRNG state, so using the same seed each frame break randomness.

The `firework.rs` example has been updated to make use of all of this.

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