Wiki: General Update

[StormFX]

The wiki needs to be updated to include additional information.

To Do

• [x] Add a page for the SlotIcon region.
• [x] Add a page for the GetGroupByID API method.
• [x] Add Netaras to the list of Contributors.
• [ ] All Regions
  • [ ] Add Wowpedia links to various items for reference.
  • [ ] Update attributes sections to list the default values for both the Blizzard Classic and Blizzard Modern skins.
• [ ] Update the Mask region page.
• [x] Update the SetCallback page.