timezone: Fix timezone page if geoclue isn't around
cc-timezone-map: Remove useless property stubs
cc-timezone-map: Correct pin coords

Duh.
timezone: Construct the map in the .ui file
timezone: Convert to composite widget templates
goa: Convert to composite widget templates
language: Convert to composite widget templates
eula: Convert to composite widget templates
network: Convert to composite widget templates
summary: Convert to composite widget templates

Note that this removes the ability for distros to ship custom summary
pages. Now that we parse /etc/os-release, I think it's for the best...
account: Remove unused model
account: Convert to composite widget templates

Remind me to completely rewrite this page at some point.. ugh, my eyes.
keyboard: Convert to composite widget templates
gis-page: Remove get_builder vfunc

All pages now use composite widget templates