Quick UI Changes and additions

Quick patch to have a little less confusion, and a little more accessibility! Here's the details:

• Added small pins to the UI that show which button needs to be pressed to select something
• Now, whenever there's a bar with two lines, an outline will surround it that says "DOUBLE LINE"
• Added a new Controller Layout in the Options menu named "Generic". It acts as a universal layout that should make sense for any standard 4-face-buttoned controller and help those who have trouble memorizing them by their symbols
• All button icons now have have an outline around the letter/symbol itself for better visibility
• Exiting a song after completing it now returns you to Level Select instead of the Title Screen