Alleyway: Alleyway DX

A big overhaul of Alleyway for the gameboy.

Adding colors, fixes and improvements.

New in this version

* Change between blueish or white background with select button on title screen
* Fixed a bug that froze the game when running on MGBA core in Retroarch

This hack includes:

* All Levels have custom colors
* Select starting stage with a/b buttons on title screen
* Scores can now show 5 digits, and max score is now 65535
* High score saving
* Mario head for lives looks nicer
* Fixed bug from original game where if you die as a small paddle on the far right, your next paddle started stuck in the wall
* Still plays ok on DMG
* Demo takes twice as long before it starts, so there is more time to select start level

Database match: Alleyway (World)
Database: No-Intro: Game Boy/Color (v. 20210227-015730)
File/ROM SHA-1: 0CF2B8D0428F389F5361F67A0CD1ACE05A1C75CC
File/ROM CRC32: 5CC01586