Updated to 0.7.0

This update includes improvements that make it much easier to add and remove configurable settings from the menus.

Changes in detail:

• Adds `OptionControl.tscn` that interfaces with `Config.gd` to make configurable settings without any code.
• Replaces existing options in menus to use the new `OptionControl` class.
• Adds example options to menus.
  • Mouse sensitivity
  • Anti-Aliasing
  • Screen shake
• Updates documentation to explain how to use the new class.

I currently plan to split the Config, AppSettings, and OptionControl work into it's own repo and plugin as well.