[NEW] Added new REFERENCE_WIDTH and REFERENCE_HEIGHT to the gmae.
[MOD] Removed "NEXUS_" prefixes from constants.
[DEL] Removed Graphics.getScreenWidth().
[DEL] Removed Graphics.getScreenHeight().
Removed the usages of GraphicsConfigures.width and GraphicsConfigures.height.

[MOD] Removed the usages of GraphicsConfigures.width and
GraphicsConfigures.height. Now they use REFERENCE_WIDTH and
REFERENCE_HEIGHT.
The game will autofix the aspect ratio.

[NEW] Now will auto-fix the aspect ratio.
[NEW] Now the Graphics.render() will scale and reanslate to fit the
screen.
[NEW] Added save parameter to Graphics.changeGraphicsConfigures().
[DEL] Removed the usage of REFERENCE_WIDTH and REFERENCE_HEIGHT in debug
panel.
[DEL] Removed resize event handler.