Update build.gradle build tools to 19.1.0
Disallow bar touches on the SmartSeeker

From now on, only scrubber manipulation is able to change the seeker value.
Update icon resources
Avoid initializing application executor outside of main activity
Make AVN client changes synchronous
Use alpha transparency on new step icons
Fix manifest XML typo - orientation changes now properly work
Refactor soft-key padding configuration
Add ElementSelector API and interface elements
Make SeekBar selectable
Make OptionList selectable
Make Generic selectable
Make ColourPicker selectable
Make CheckBox selectable
Clear wallpaper resource on Settings destroyer