Support dynamic connect and disconnect for Joysticks & Midi Controller

[DocMoebiuz]

Is your feature request related to a problem? Please describe.
MobiFlight Boards can be connected and disconnected while MobiFlight is running.
This is currently not available for Joysticks and Midi Controller.

Describe the solution you'd like
Support dynamic connect and disconnect for Joysticks & Midi Controller

Describe alternatives you've considered
n/a

Additional context

[Koseng]

I think reconnect for midi devices does already work. But only when on startup of mobiflight a midi device was connected.