GPII-313: Adding transformations for Android

This branch assumes to have included into it the source code from the following pull requests:
* GPII-277 (https://github.com/GPII/universal/pull/154, in relation with https://github.com/GPII/android/pull/4)
* GPII-397 (https://github.com/GPII/universal/pull/165, in relation with https://github.com/GPII/android/pull/12)
* GPII-398 (https://github.com/GPII/universal/pull/166, in relation with https://github.com/GPII/android/pull/13)

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

EDITED: This pull request can be tested on a device within the code from https://github.com/javihernandez/android/tree/GPII-277_GPII-397_GPII-398