Before: After a rightclick -> "Modify Account" on an account in the
roster the preferences of the account are shown but the account is not
selected in the account list.
After: account will be selected in the account list too
This allows us to import the app module without triggering
dependency detection
Also add is_installed() for checking if a dependency is installed and
disable_dependency() in case we dont want to use a dependency
Markus Wintermann
Philipp Hörist
Philipp Hörist
André Apitzsch
Daniel