Add button templates for 7902, 7935, 7940, 7960, 7970, support big endian...

Add button templates for 7902, 7935, 7940, 7960, 7970, support big endian machines with proper byte ordering, fixed caller*id on 7910 (others?) and more. Bug #4398


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5811 65c4cc65-6c06-0410-ace0-fbb531ad65f3