Performance Improvements and Flow changes

• A full Godot plugin:
  • Must be enable before use;
  • To work with, add a node like any node in Godot Game Engine;
• Performance improvements:
  • Pre render view area;
  • Update raycasts based on configured Timer;
• Usage improvements:
  • As a plugin, we can render a preview in editor mode;
  • All colors, now change when state changes (aka node enter a danger area);
  • Added signals to notify when node enter / exit view area;