[N64] Ice64 3.7.0 beta

Donkey Kong 64 (Nintendo of America Inc., 22.11.1999)

ICE64 v3.7(Beta) is released! 23/10/2012

• upgrade zlib from v1.2.5 to v1.2.7
• fix crash when "Change Plug-ins" menu option is selected
  • a test change was left behind and totally forgotten
• fix DK64 missing zipper effect, fade-in/out bg image effect during bananaport and barrel entry/exit and bg image when in-game "START" button is pressed
• improve Batman flickering during scene transition