Changed the English US keymaps to implement a strict US key map
with no additional ALT functions.
Fixed a bug copying the alias in the InputDevice copy constructor.
Added support for end of line comments in KCM and KL files.
Added the German keyboard layout.
Sorted the keys in the keyboard layout files by physical arrangement
to make it easier to maintain them.
Bug: 6110399
Change-Id: If44d83de5b98f2bf0016cbb8e12264387b286aaa
8bca94ad83