Arcade Manager v6.3

New feature

Better BIOS files handling:

• Does not delete BIOS files during cleanup (fixes issue #5 )
• Copies BIOS files during file copy, even if they're not listed in your CSV file

Bugs fixed

• Stops telling there's a new version erroneously (issue #46 )
• Fixes a 404 error that could happen during overlay download under very specific conditions (issue #48)