Reimplement asset layers #7
Description
Implementing layers with bevy assets, while convenient, has issues:
- Assets are completely unavailable until at least one frame has passed.
- Assets can take as long as they'd like to load, with only eventual consistency.
Need to decide if this is acceptable, or if layers should bypass assets entirely.
Some useful things from continuing to use assets:
- Layers can be loaded over the network or from compressed blobs.
- VFS integration.