recent clang started warning when seeing non-UTF8, fixed.

Most instances were in comments, with the exception of a doxygen
file and one source file. I switched to ASCII for most compatibility,
after noticing other instances of these people's name were already
in ASCII. Apologies for mangling their names.

Change-Id: Ib85f819c76ba8b56f720e3a6a6b7d392a6f45703