roomslist: reimplement filters implementation details: YO DAWG, I herd you like QSortFilterProxyModels, so I put a QSortFilterProxyModel in your QSortFilterProxyModel in your QSortFilterProxyModel in your QSortFilterProxyModel so that you can filter while you filter while you filter while you filter!

[patterns]
**.h = native
**.c = native
**.cpp = native
**.lua = native
**.txt = native
**.pas = native
**.inc = native
**.hs = native