* Allow configuration of checkout folder and version tracking type
via Plugin Configuration
* Display message to use if checkout folder is not configured or a
non-release version is running and version tracking against releases
is enabled
* Clear version cache when a change in the check configuration is
detected
* Mark check configurations for which an update is not possible with
a little exclamation mark
(cherry picked from commit 8666a28)
When any plugins are enabled/disabled, the client now gets a trigger to fetch a fresh list of update information from the server. This should take care of any old popups still hinting at now uninstalled plugins.
