Add GridLayer class

[Xrayez]

Allows to display infinite grid at run-time. Useful for debugging purposes. This means that you can move Camera2D to any place, and grid will be automatically redrawn based on canvas transform.

Simply add GridLayer node:

This requires GridRect node implemented in Goost, which is instantiated automatically in the editor with default parameters useful for debugging/editing (with the same colors in Godot's canvas editor). You can also add multiple GridRects, and all will be rendered alongside.