Android: Correctly escape backslashes in deployment settings

When outputting the deployment settings on Windows, the paths might
have backslashes. These need to be escaped, otherwise they will simply
be removed by the JSON parser (or converted into whatever they happen
to represent given the neighbouring character.)

Task-number: QTBUG-33926
Change-Id: I11f1bc7d1f8082c73329bdc02fb8d653a0b5c0ee
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Android: Fix backspace bug with 4.3 stock keyboard

The Android 4.3 keyboard will cause setComposingRegion() to be called when
backspacing over an existing word. If we don't implement that, the editor
will be out of sync with the input method.

Task-number: QTBUG-32955
Change-Id: I6c4ff786269a4e74c70a093c5f03c4c5a5727dd5
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>