PS3 PKG compilation, bug fixes

Additions:

• Added PS3 to platform selection. Compile straight to a PS3 PKG when compiling a GH3 or GH:WoR song
• Added button to import metadata and file paths from a Clone Hero .ini file on the metadata screen

Fixes:

• Fixed a crash when converting pak to mid if the .qs file was missing
• Fixed a crash when a force note appears in a song without notes underneath it