If there is no android:codes specified, the first character of
keyLabel's code point will be used instead.
Also introduce readable codes as @integer/key_XXX resources
Bug: 2973749
Change-Id: If9021ca35f9a7b922817e2099186fce0cd993652
This change is only for English locale. For other locales we should
need specification because keyboard layout and alternations are
different by locale.
Bug: 2959169
Change-Id: Ib63f53ce6c30d75eff78777aa0049b05d58ce55f
Long-press on shift and symbol keys will conflict with press-and-hold
these keys and press normal key (a.k.a. multi touch support).
Bug: 2910379
Change-Id: I27007b55a30a3699bf63fd8f64d58c4b23d97d9f