Use standard addons structure

[fire]

Hi, I was wondering if you can move the layout into the standard "addons/Virtual-Joystick-Godot" structure for the redistributable and use the outside structure for demos.

The folders in your project may collide with other file paths. We only use 3 folders in our project.

1. addons
2. <project_utils>
3. <project>

Note:

Typically it's "addons/virtual_joystick_godot" in the Godot Engine style guide, but it's no big deal.