v4.4.2: Prepare for KeePass 2.61

If the option 'Check for update at KeePass startup' is activated, KeePass 2.61 will initiate the update check before trying to open a database (asynchronously). If an update is found while a master key prompt dialog is displayed, the availability of the update is now indicated by a banner in the dialog.
As preparation for that, this part has been removed from EarlyUpdateCheck if KeePass >= 2.61 is used.

One-Click plugin update and the enhancements to the plugins form are still available