phyphox-android

Bump versionCode as it was already used in the Play Store upload that we had to retract due the bug fixed with the rpevious commit.

Remove debug output from previous commit

Fix "save all" function for experiments loaded from zip files.

Update Paho submodule to current master

Run XML loading on separate thread (moving from old AsyncTask execute to a thread pool executor) to mitigate blocking of the loading thread if the Bluetooth thread is waiting for a timeout. The proper solution will be a restructure of the Bluetooth part to allow cancelling the timeout as well as moving multiple parts of phyphox from AsyncTasks to executors.