GPII-313: Adding transformations for Android

This branch assumes to have included into it the source code from the following pull requests:
* GPII-277
* GPII-397
* GPII-398

Changes in this pull request:

- Removing the settings handler from Talkback's solution entry to avoid
  problems with the new version of the solution registry

- Adding Settings.System solution entry and transformations for the
  following common terms:
* hapticFeedback
* screenDim
* screenRotation
* screenDefaultRotation
* screenOffTime

- Adding Settings.Secure solution entry and transformations for the
  following common terms:
* speechRate
* pitch

- Adding the following transformations into audioManager's solution entry
* volume
* volumeTTS

- Adding the following transformations into persistentConfiguration's
  solution entry
* fontSize
* language