Add folder icon support for OG Xbox games

[Masamune3210]

The game partition of a Xbox disc image (which the community seems to be obsessed with calling XISO, confusing numerous people daily) is regularly extracted to either be used in emulation or on actual hardware. Folder structure is the same as on disc, with the main executable (typically named default.xbe) being found directly inside the folder. Could support be added for showing the icon and property sheet on the folder should it be found?

[GerbilSoft]

This would be similar to what's done for Wii U packages (and extracted Wii U titles), so I'll look into it.

[GerbilSoft]

Turned out to be fairly straightforward to add.

Some issues encountered:

• There was already a type called "Extracted", which referred to a standalone XDVDFS partition. This is now just "XDVDFS".
• Adding "Extracted" bumped up the enum values, which broke XGD detection because that relied on the enum values matching the XGD version. XGD detection now uses the enum values.
• XDVDFS, like most Windows file systems, is case-insensitive. Linux file systems are usually case-sensitive. The disc image I tested, "Kinect Rush: A Disney Pixar Adventure", has the boot filename "Default.xex", which breaks on Linux if searching for "default.xex". I added a few permutations that should fix this in most cases, but if there's any others, I'll need to add them later.

Will merge this to master once I verify that the Windows build isn't broken. Please let me know if there's any disc images that aren't detected properly due to case-sensitivity issues (or other issues).

[GerbilSoft]

Merged to master. Feel free to file a new issue if you encounter any issues as mentioned above.

[Masamune3210]

Sweet! I'll try to test it out before release if I have a chance. Thanks again