This change introduces KeyboardSet and SubKeyboard XML definitions to
represent a set of keyboard layouts.
Bug: 5002108
Bug: 5679585
Change-Id: Ib6c8d5936187381bb6725c9fe574e93871c01a86
I left TODOs in Suggest.java because we must pay attention to locale
when changing character's case. Filed another Bug: 4769095 to track
that.
Bug: 4768050
Change-Id: I1ae2c4ffd2208403a8c2a25dd3a56b71dcefc826