SpecialGlobalGroupPermissions: Use css columns instead of tables

* Simplifies HTML a lot.
* Will automatically use one, two or three columns based on
  available window space.
  On narrow windows this will use one column instead of two very
  tiny columns. On a full-width desktop window this will now
  render three columns (e.g. 15" / 1440px display).

Change-Id: I57009bc9338351754008fed4c3d7635e5630bc04
Merge "SpecialGlobalGroupPermissions: Use css columns instead of tables"