Switch between multiple connected bluetooth devices

[J-Schaefer]

When I have multiple bluetooth devices connected like headphones and speakers or even a smartwatch, the dialer decides automatically which one to use for audio. So it happens for example that the call is redirected to my watch. I would like to be able to switch between multiple devices.
This issue is loosely related to #96, just that instead not being able to switch to any other device, I would like to have the option to switch between multiple bluetooth devices.
In other apps this is solved by having not only the option to switch to 'phone' and 'speaker' but also listing all available bluetooth devices there.

[Maxitendo1]

@J-Schaefer SimpleMobileTools apps were sold to ad and spyware company. Fork is here:

https://github.com/FossifyOrg