[Android] Access the data folder

[cristipurdel]

Do not know if this is implemented or not, but it would be nice to have as a feature.

Reason: this is needed for BoincTasks integration, see Fred's post in
https://forum.efmer.com/index.php?topic=1090.msg6578#msg6578

Currently it is working with the older version of native boinc, but for Android < 5.0
If this would be to work, you can see the status of all the androids (in my case around 20) devices in one table

The renaming done in #2770 will definitely help a lot

If root is needed, than you can make an option in preference to enable root (for root + advanced users)

[adamradocz]

If I understand correctly, you basically need a feature to set the Remote Host IP and the GUI RPC Password to access the boinc.

[cristipurdel]

If you have a device with Android < 5.0, you can run native boinc on it, and than install boinctasks on windows, and you will see that it is discovered.

Better sync with Fred on this issue on his forum, since boinctasks is depending on boinc to mange multiple devices

This would be very useful for folks with multiple android devices

[adamradocz]

Same as #1699.