Policy Plus - Open all Registry roots

It came to mind that Policy Plus had no way to edit the Registry of users who are signed in - the "user hive" option won't work when the hive file is already mounted. Also, it couldn't open arbitrary hive files for computer policies.

Therefore, today I updated the "Current Registry" policy loader to accept an argument: a rooted Registry path.

Entering a path after the root works too. Therefore, it's now possible to treat any Registry key as a root. Computer hives can be edited by manually mounting them and typing the mount path into the appropriate textbox. Editing computer settings in that way is dramatically less likely than editing a user hive, so at the moment, I don't think it's worth complicating the UI for.