Support keyboard entry of non-ASCII characters

Add characters to the keyboard mapping to allow them
to be entered into the AVD from the developer's PC
keyboard.

This mapping supports the non-ASCII keys that appear
on the "US International" keyboard. Most of the Latin-1
characters (but not all) appear on this keyboard.

This change does not remove support for any keys.

b.android.com/200042

Change-Id: I65d54eb36183382b171c388b26848941eb0ff8d9
(cherry picked from commit dac57966)