PROV-729 Attribute-specific settings on UI placement level are now being loaded correctly via installer

The underlying issue was actually caching. The UI processing takes
place right after the metadata element processing in the installer and
at that point the model bundle definitions were not loaded correctly,
because there were no applicable element codes and therefore no
available settings.

To make sure they’re loaded I added a way to refresh those definitions
without using the cache which is now being used by the installer. The
default method still uses caching so unless you pass the ‘dontCache’
option to ca_editor_ui_screens::getAvailableBundles or
ca_<your_table>::initLabelDefinitions, performance should be the same.
Merge branch 'master' of github.com:collectiveaccess/providence