Refactored UI for managing mods

[cdp1337]

Instead of selectively installing/removing each mod by name, provide a better UI for managing mods more quickly

[cdp1337]

Full functionality to be expected:

• Remove mod (done)
• Reinstall mod (done)
• Update mod (done)
• Display updates available in listing
• Install all updates while in listing
• Search for and install new mods