[FEATURE] [Android] Add the option to be able to stop audio playback when Osmin plays an instruction.

[susobaco]

Hi, I have noticed, that, when my phone is playing a song, it does not stop when Osmin plays a navigation instruction, so the audios are mixed and the instruction is not well understood. I think it would be a good option to have the possibility to mute the audio while Osmin plays the instruction. Thanks for the work.

[janbar]

The osmin app cannot handle the sound mixer of the device (not permitted), or I don't know how to make that.

[susobaco]

Ok, although I am not a programmer, I will try to investigate. Osmand does. Thank you.

https://github.com/search?q=org%3Aosmandapp%20music%20stop&type=code