Update to new session API.
Drop references to obsolete sigrok-commits mailing list.
Remove output modules from about dialog.

PulseView doesn't support output modules at all.
Fix bug #392 by improving empty list/map handling
Fix comment and increase readability in probes.cpp
Check for device instances before blindly trying to release them.
CMakeLists.txt: For Android, make a library out of the native code
Setup environment for SRD on Android
Install logging callbacks for Android
Added files for building Android APK
Android: Use environment setup from library instead
Merge remote-tracking branch 'github/pinch-zoom' into android