[BRLTTY] Android support.

[Dave Mielke]

The latest Android apk contains several infrastructure fixes as briefly 
described below.

Brltty now runs faster, and makes less demands on device memory.

Changes to settings now take effect immediately (restarting brltty is no 
longer required).

The preferences menu now works, and preference changes can now be saved 
and restored.

Command learn mode now works.

Speech now works, so functionality such as autospeak, speech-based 
navigation, etc can now be used.

Alert tunes now work.

Braille devices which can emulate keyboard function keys can perform
global Android actions as follows:

   F13  Notifications
   F14  Back
   F15  Home
   F16  Recent Apps
   F17  Quick Settings

-- 
Dave Mielke           | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario   | http://Mielke.cc/bible/
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