* Use avian 0.2 instead of relying on a patch

* Update for Bevy 0.15 * `NavMeshBundle` has been removed and replaced by required components. [`NavMeshSettings`](https://docs.rs/vleue_navigator/latest/vleue_navigator/prelude/struct.NavMeshSettings.html) is now the main entry point for spawning a NavMesh that will be automatically updated * Avian is not supported out of the box as it hasn't been released for Bevy 0.15 yet. It should work if you patch it in your dependencies to https://github.com/Jondolf/avian#e23d070e

* agent radius can be used on the outer edges of a triangulation when generating a NavMesh #64

* Fix system ambiguity between NavMesh update and transform propagation #62