godot_dart 0.9.0

Changes in godot_dart 0.9.0

• Add type safe SignalX objects supporting automatic registering / deregistering.
• Fixed an issue with ScriptInstances not detaching themselves from their Dart counterparts on deletion.
• Attempted to refactor several files to make analysis faster.
• Fix weak conversion from StringName / GDString in Variant.cast

Changes in godot_dart_build 0.7.0

• Add the ability to use @GodotProperty on getters.
• Allow sending RPC messages to specific peers.
• Fix generation of RPCs in several situations.