Directory filesystem fix, Control maintenance

Created by: sonninnos

Major:

• Updated directory filesystem with illegal filenames
  • In practice fixes the Space Taxi 3 input config screen in Windows directory mode, because con needs to be named __uae___con on the host and vice versa in the emulation
• Allowed launching extracted .slave files
  • Does not actually launch the correct slave when there are multiple slaves, so for now it just does the same as launching the directory!

Minor:

• Added RetroPad B to turbo fire options
• Defaulted RetroPad X to Space
• Defaulted RetroPad mapping options visibility