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
Move java code to a different directory so that the unbundled
version doesn't try to compile the native code again.
Change-Id: I05cf9e643824ddc448821f69805ccb0240c5b986