Started GUI base
Refactor for a generic button
Created Gui base with relative positioning and sizing.
Changed names of a few things
Added GameContainer to cotnrol game rendering using Gui Library
Added basic click handlers for gui and game
Small bugfix
Cleaned up code and making all calls to the IClickable events
Refactored to put mouse events into GuiScreen
Merge branch 'feature/gui'

Conflicts:
	TeelEngine/Path/Path.cs
	TeelEngine/Path/PathFinder.cs
	TeelEngine/Path/PathNode.cs
	TeelEngine/TeelEngine.csproj.DotSettings
	TurnBasedGame/TurnBasedGame/GameStateDefault.cs
	TurnBasedGame/TurnBasedGame/TurnBasedGame.cs