Updated to 0.4.3

Most of the changes in the 0.4.3 and the prior 0.4.2 update are in regards to handling music. 

Changes in detail:

• Additional AudioStreamPlayers in scenes make it clearer where background music streams should be linked.
• Updated documentation to account for the plugin expecting "Music" and "SFX" audio busses.
• New ProjectMusicController autoload that allows blending music between scenes, without changing the workflow of adding music to scenes.
• Autoloads are automatically set on plugin activation. They are also automatically removed on deactivation.

Previous changes in version 0.4.1 was mostly to support the template also being available as a plugin in the Godot Asset Library.

Links:
Release v0.4.3
GitHub
Godot Asset Library