GNOME 3.14

Do not merge. There are a number of issues to be fixed first, just to avoid rebuilding stuff over and over in hydra. Will populate this post with more information.

First of all, gdm runs and the desktop runs. Terminal opens and nautilus too. Some other apps crash.

High priority:

- [x] networkmanager uses `/sbin/arping`
- [x] Need to move the gnome-icon-theme `setup-hook.sh` down to hicolor-icon-theme to transition to adwaita-icon-theme
- [x] The mouse becomes invisible when e.g. opening the activity.
- [x] epiphany theme is broken, the header/toolbar is transparent
- [x] evolution theme is completely broken I think, it has black background
- ~~totem cannot create thumbnails, can't open some videos that would instead open in GNOME 3.12~~
- [x] gnome-online-accounts does not start, should be trivial to fix: `Settings schema 'org.gnome.online-accounts' is not installed`
- [x] gnome-documents doesn't start, maybe a mismatch with clutter/gtk
- [x] gnome-photos wrapper is broken

Low priority:
- [ ] gnome-calculator search provider works but spits this error: `org.gnome.Calculator.SearchProvider[1903]: Error: ErrorCode.UNKNOWN_VARIABLE`
- [ ] Icons of gnome-documents, gnome-photos, evolution ecc. are not shown in the gnome-shell activity