[arch-general] Moving qgis from [community] into the AUR.

QWT was bumped to 6.0 and qgis is currently incompatible with the new version. In order to update qwt, we will have to drop qgis into the aur. I have looked into patching qgis to be compatible with qwt 6. I managed to get an initial patch accepted, but there is a lot more work to be done, on code that I'm unfamiliar with. upstream bug report: http://hub.qgis.org/issues/3562 -Thomas Dziedzic