Use masks instead of collision layers for SpatialQueryFilter

[Jondolf]

Replaces collision layers (groups and masks) with just masks in SpatialQueryFilter. Spatial queries don't necessarily exist as physical objects in the world, so it doesn't make sense for them to belong in groups, and this also just makes the API nicer.

Methods

Removed with_layers in favor of:

• with_masks_from_bits
• with_masks

Example

// Previously
let query_filter = SpatialQueryFilter::new().with_layers(CollisionLayers::from_bits(0xffff_ffff, 0b1011));

// Now
let query_filter = SpatialQueryFilter::new().with_masks_from_bits(0b1011);