[TalkBack] Add speech quick settings to global context menu

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Talkback really needs separate voice settings from Android. Use cases for this 
might include having a quick voice like Espeak for screen reading, and 
something slower but more natural like Ivona for apps like book readers. It 
also needs separate controls for rate and pitch. Spiel implements all of these 
functions, with the rate and pitch settings being set by factors of the current 
system setting. This would also allow quickly switching languages through the 
global contecst menu, something that has been requested by many people on the 
eyes-free group.

Original issue reported on code.google.com by piterm...@gmail.com on 13 Apr 2013 at 12:41

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Original comment by caseybur...@google.com on 14 Apr 2013 at 11:59

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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Summary of requested features:
- Switch between available engines, voices/languages
- Quickly set default prosody (pitch, rate, etc.)

Original comment by alanv@google.com on 30 Apr 2013 at 7:53

• Changed title: [TalkBack] Add speech quick settings to global context menu
• Changed state: Accepted

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I think there should be the ability to have a separate tts engine or voice for 
screen reading and another for ebooks, for example.

Original comment by mcigo...@gmail.com on 1 May 2013 at 3:18

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Original comment by caseybur...@google.com on 29 May 2013 at 8:03