Update getmaps.lua

Added more categories
Alphabetize list
Cleaned up code
Update getmaps.lua

Fixed spacing
Update getmaps.lua
Update getmaps.lua
Update getmaps.lua
Update getmaps.lua

Finally fixed all spacing. Why are Github's spacing options so difficult?
Update getmaps.lua

Hopefully fixed now?
Merge pull request #522 from Kefta/patch-1

Organize/add map categories