Handle Tiled worlds

[adrien-bon]

Closes #55

[adrien-bon]

Nothing fancy yet, just moved around files so we can have everything related to Tiled worlds in a dedicated module.

@JtotheThree: please use this branch as destination if you want to open a PR
(no hurry though! :))

[adrien-bon]

Next things to do:

• Wait for official rs-tiled release with world support. PR = World File Parsing mapeditor/rs-tiled#320
• Analyze initial loading performances and find a way to improve them if needed, We want to be able to load at least "medium sized" maps without any stutter (like 32x32 tiles)
• Double-check chunking code: it feels like we may have a situation where we spawn / despawn maps every frames if we have several Cameras:
• Seems like tiled::World field source is always empty. Posted a comment in rs-tiled PR.
• Find a way to pass along PhysicsSettings<T> from the world entity to the maps: we want the map to inherit the settings from their parent world
• Check what happens if we have a world with infinite maps. Eventhough it does not make a lot of sense, I'm affraid we may currently have a crash if we do so (map.widht().unwrap() in world/asset.rs). We may just throw an error instead
• Would be cool to have some sort of debug visualization of the chunking area (like a gizmo ?). Obviously, not very high in the prioty list :)
• Make sure we have proper documentation for the new types and add a dedicated section in the book regarding usage of worlds
• Test Tiled user_properties with worlds. Add a mechanism (with a marker component ?) to keep around some objects from a map when it is despawned then restore them when the map is spawned again.

[adrien-bon]

Just tested to spawn physics colliders with our test world: it's very laggy.
That's probably because we have one collider per tile.
We'll probably need to optimize that and find a solution to "merge" colliders together.

[adrien-bon]

Encountered what seems to be a randome crash:

2024-12-29T17:42:28.568937Z  INFO bevy_ecs_tiled::map::asset: Loaded map 'world/world_map025.tmx'    
2024-12-29T17:42:28.711035Z  INFO bevy_ecs_tiled::world: World 'world/world.world' has finished loading, spawn it
2024-12-29T17:42:28.711126Z  INFO bevy_ecs_tiled::map: Map 'world/world_map021.tmx' has finished loading, spawn it
thread 'main' panicked at /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/bevy_ecs-0.15.0/src/system/commands/mod.rs:1982:13:
error[B0003]: src/map/loader.rs:53:33: Could not insert a bundle (of type `(bevy_core::name::Name, bevy_ecs_tiled::map::components::TiledMapMarker)`) for entity 13v1#4294967309 because it doesn't exist in this World. See: https://bevyengine.org/learn/errors/b0003
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Encountered a panic when applying buffers for system `bevy_ecs_tiled::map::process_loaded_maps`!
2024-12-29T17:42:28.712193Z  WARN bevy_ecs::world::command_queue: CommandQueue has un-applied commands being dropped. Did you forget to call SystemState::apply?
2024-12-29T17:42:28.712299Z  WARN bevy_ecs::world::command_queue: CommandQueue has un-applied commands being dropped. Did you forget to call SystemState::apply?
Encountered a panic in system `bevy_app::main_schedule::Main::run_main`!

[adrien-bon]

Remaining items on the checklist will be handled in the broader v0.6 roadmap