Added some sound effects and music to the main menu. Changed Main Menu splash art to display using GUI instead of a Sprite.
Merge branch 'master' of https://github.com/jsdodgers/Bel-Nix.git

Conflicts:
	BelNix/Assets/Audio.meta
	BelNix/Assets/Resources/Maps/Tile Maps.meta
	BelNix/Assets/Saves.meta