New version of the SNES emulator for PC.

Changelog:

• Major source code cleanup (lib/, ui/miu/, ui/vai/)
• Cheat code editor was broken in v0.026, this is now fixed
• Cheat code file format simplified for human readability
• Makefile install target improvements [belegdol]
• libui replaced with miu GUI library
• Custom video / audio / input drivers replaced with vai HW library
• ppc and ppc64 libco targets added [Vas Crabb]
• x86 and x86-64 libco targets now work on OS X [Lucas Newman]