The Backend Re-write

Changes:

• .szs is now part of the recognized files (Fixed #2)
• Added more file icons
• Folders can now be properly re-ordered
• Prevented the program from "Not Responding" while it's Yaz0 Encoding
• Made Archives created with Old, broken tools that have badly named directories get fixed when loading into WiiExplorer (You still need to save to keep these fixes)

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