[Feature - Discussion] Restore state

[Schlaubischlump]

Allow changing the device without loosing the spoofed location.

Proposed solution: When changing the currently selected device save all information about the current state to memory (maybe by making MapViewController codable?). Pause the location spoofing. When swichting back restore the state. The state might include information about toolbar buttons as well. It might be useful to move the device selection to a sidebar.