Apis 1081 explore desktop freezes when device is turned off during streaming

[SonjaSt]

• Removed reconnection counter / trying to reconnect multiple times (based on Maziar's request)
• Added a step to check for services offered by the bleak client and exit if the EEG service is not listed anymore (not on Mac)
• Also added unpairing (not on Mac)

This isn't tested on Linux and should be regarded as a hotfix for the issue, turning off the device, reconnecting, disconnecting all seems to work "as expected" now on Mac and Windows.

[SonjaSt]

I've added a wait on disconnect before trying to reconnect on Windows - only on Windows does not waiting cause ExploreDesktop to freeze in my (limited) tests. It seems to get the service and characteristic just fine and then... can't notify on the characteristic.

Anyway, this "fix" was tested on Mac, Linux and Windows and "works" (it worked for me).

In general, calls to connect, disconnect and get characteristics from the backend seem to occasionally freeze the program on the different OSes with different behaviour, which leads me to believe we're not handling disconnects or lack of updates correctly, this definitely should be revisited.