[Development] Qt Speech: text to speech in 5.6

[Frederik Gladhorn]

Hello all,

I would like to propose the tts parts of QtSpeech (the current dev branch) for 
inclusion in Qt 5.6.0. Along with that I'd like to invite everyone to review 
QtSpeech, it's not much code and works on most platforms. Notably iOS is still 
missing, although I have proof of concept patches (if someone wants to finish 
them let me know, I don't know if I'll get around in time). I have no idea 
about non-desktop Windows in this area.

Cheers,
Frederik