New action map implementation

[BastiaanOlij]

Currently controller logic hasn't been changed to the new Godot 4 system, before implementing that I want to make some big updates to the action map system. A basic foundation is already merged into 4.0-dev as part of the first steps logic.

This PR will cover the following changes:

• New Godot side objects to store an action map as a resource
• Editor plugin to allow editing the action map resource with a default action map configuration
• Replacing the old JSON action map loader with a loader based on the new action map resource
• Making everything work with the new controller system in Godot 4

This PR has dependencies on:

• Change over to using operator[] bruvzg/godot#1
• Implementing dictionary operators godotengine/godot-cpp#656

[BastiaanOlij]

Slowly making some progress on it, you can edit the resource that contains all the data by double clicking on the tres file, it currently shows the editor in the bottom dock:

Only actions can be edited at the moment, interaction profiles is next.

[BastiaanOlij]

Closing this PR, this logic is currently being ported to Godot 4 core and will no longer be completed for the plugin