v0.23: "Sidewinder release"

Changes from Antiriad:

• Added support for 12 buttons on each joystick.
• Added new default joystick settings:
  button 9 = player start (this button is the 'start' button on a sidewinder)
  button 10 = player coin slot (this button is the 'mode' button on a sidewinder).
  It's great, now I can play on raine without leaning over the keyboard =).
• Fixed sidewinder in allegro (added a second copy of the code as 'sidewinder b').
  From what I can tell, the 'sidewinder b' should function the same as the system16 driver...
• BIG THANKS to Paul G. for the sidewinder gamepad :).
• Added Player 3 and 4 Controls in Snow Bros 2, Hit the Ice.
• Fixed Taito Tetris romlist (2 of the listed roms were unused).
• Fixed tripple buffer interfering with frame skip radio buttons in gui.
• Fixed most sprite sync in Tatsujin 2.
• Fixed most priorities in Master of Weapons, Ashura Blaster.
• FG0 banking in B-System (eg. screen clear in Rambo 3, FBI logo in Violence Fight),
• Updated translation template.cfg (oops, forgot).
• Changed Frame Skip option in gui.
• Replaced Tripple Buffer scroll routines, so they (should) work with vbe/af.
• Added Combatribes player 3 controls and dsw to activate them (thx mayuga).
• Changed TNZS guide url in cheats.txt (thx chris).

Non Changes:

• We didn't publically add any new games since 0.22.
• We didn't make any modifications to the Chase HQ emulation.