Cursor.theme file not supported

[ItsProfessional]

Many cursor themes (such as quintom) do not ship with a index.theme file. Instead, they ship with a cursor.theme file. The syntax is indentical. Some ship with both as well.
As of now, nwg-look seems to only look for the index.theme file, and since the theme didn't have it it didn't show up in the cursor list.