This change is needed to introduce new theme easily. As a starter this
change introduces Keyboard.popupHintIcon attribute and
Key.keyLabelOption.popupHint flag to show popup hint icon that is
previously specified by Key.keyHintIcon attribute.
Bug: 4436327
Change-Id: I6b1c5c1b88eece541141b2d2cedd164ee02e5c2a
Unfortunately current Master seems have bugs in resource
selection. The xml-en/kbd_qwerty.xml is added to avoide those issue as
work around, and must be removed if the issue is fixed.
Bug: 4442045
Change-Id: Ic43d66e8669fb63e2c3f0b8b9aae9178ca3c32b5