Mouse picking

[nuzzles]

Mouse picking became a first class citizen in bevy 0.15.

Would be good to add picking for bevy assets.

[nuzzles]

I'm still new to picking in bevy. Do you know if bevy natively support picking for AABB components? We just added those with view culling, so it may make sense these double as hit-boxes for picking @RobertBrewitz .

[RobertBrewitz]

It does not look like they double as hit boxes for picking, bevy_picking seem to only uses Aabb for a view culling query.

But implementing a picking backend is fairly simple for bevy_vello assets.

[RobertBrewitz]

Started a prototype here #160

It adds a new VelloPicking component that is pickable, it takes a BezPath and an Affine.