Update to bevy 0.16-dev

[Shatur]

Summary of changes:

• Changes due to 0.16 update:
  • Replace all Trigger::entity with Trigger::target.
  • The Component trait now requires a Mutability type.
  • Minor import changes.
  • Replace never_param_warn on systems with an explicit check. The panicking behavior now depends on system params.
  • Replace postcard::Result with the new Result type from Bevy. It's much more flexible; I can define proper error messages in both the library and user code.
  • Update hooks that now accept HookContext instead of separate arguments.
  • The EntityMapper trait is now a bit different: map_entity is now called get_mapped and contains the new set_mapped method. I can't implement it for structs that hold references, so I put an unimplemented! stub. Bevy does the same. It's not really elegant - maybe we'll figure something out later on the Bevy side.
  • Deprecate replicate_mapped and related functions. Now all components have a method to map entities. Events still require mapping.
  • Replace manual MappedEvent implementations with the derive macro.
  • Remove parent_sync. It's no longer needed; users can now just replicate ChildOf.
  • single, which we use in tests, now returns Result, so I added unwraps.
• no_std support:
  • Replace all std usage with core and enable corresponding lints.
  • Auto-enable usage of portable-atomic for bytes, similar to what Bevy does for portable-atomic itself.
  • Use log directly since bevy_log doesn't support no_std yet. The issue is caused by the tracing dependency. Bevy also uses log directly in all no_std crates; it's compatible with tracing, so there's no effect for users.
  • Add a compilation check for GBA to CI.
  • We can't mention Transform in docs since we are no_std now. There was only a single place or two. I just rewrote them a bit. Doc-examples are fine since they use dev-dependencies.

[codecov]

Codecov Report

Attention: Patch coverage is 78.37838% with 32 lines in your changes missing coverage. Please review.

Project coverage is 79.84%. Comparing base (ef6d9f5) to head (bb7ee53).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/server.rs	61.29%	12 Missing ⚠️
src/shared/event/server_event.rs	50.00%	4 Missing ⚠️
src/shared/event/client_event.rs	62.50%	3 Missing ⚠️
src/shared/event/ctx.rs	50.00%	3 Missing ⚠️
src/server/replication_messages/mutations.rs	92.59%	2 Missing ⚠️
...ed/replication/replication_registry/command_fns.rs	81.81%	2 Missing ⚠️
...hared/replication/replication_registry/rule_fns.rs	71.42%	2 Missing ⚠️
src/scene.rs	50.00%	1 Missing ⚠️
src/shared/event/server_trigger.rs	0.00%	1 Missing ⚠️
src/shared/replication/replication_registry/ctx.rs	75.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #428      +/-   ##
==========================================
- Coverage   80.30%   79.84%   -0.46%     
==========================================
  Files          53       52       -1     
  Lines        2797     2774      -23     
==========================================
- Hits         2246     2215      -31     
- Misses        551      559       +8     

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