Protection, Progress, and (Possibly) Empty Drives

[mnadareski]

This PR is four-pronged:

• Fixes for protection scanning, specifically for SolidShield 1 and a more accurate way of determining file type other than the extensions (where possible) (reference Copy Protection Additions #83 )
• Added a rudimentary progress indicator callback for the dumping process (this will probably be removed in the future when the integrated commandline window gets added)
• Added support for selecting drives that Windows sees as empty. This should allow non-WIndows filesystems such as HFS and 3DO to be dumped properly, even if we don't know if there's a disc there
  • This change makes it so that the first known active drive is selected even if all drives are listed
  • This change also adds a check before dumping a "missing" disc just so the users know that there may not be anything actually in the drive
• Added a C# implementation of Unshield and removed the iXcomp external calls in the process