account: Make sure realmd watch is cancelled

In the case where we're changing languages realm_manager may be null but
a valid watch is setup.
Updated Bulgarian translation
Updated Lithuanian translation
Updated German translation
Updated slovak translation
build: Remove player module
build: Add connman page

Replaces network manager page with connman
assistant-gd: Disconnect visible-child signal on dispose

This signal gets fired on closing gnome-initial-setup but the page has
been disposed by this time so update_action_widget causes a segfault.
connman: Hack to fix grab issue
build: Fix race on generated file when parallel building
connman: Add service checks to make sure we don't crash on a non item
connman: Fixes to make sure ordering in dispose is correct

This should make sure that we're in a better state when the
dispose/construct happens on langauge change/page rebuild.