Add the ability to migrate server directories

[macarooni-man]

It would be beneficial to allow the user to move the server folder to an alternate location, such as a secondary drive. This would require the following infrastructure:

• User permissions for the destination need to be checked before doing anything
• Alternate server paths need to be stored in a centralized database (such as the global config file) for auto-mcs to check those paths for servers on boot
• Possibly add the ability to set a default server path, and backup path, in a global settings menu