Port "Strip Unicode" feature from ICS branch into JB-MR1

This feature add support for strip unicode characters that are not
supported for 160 character SMS.

Change-Id: I10c8f35b86f009b5484754572ff6ea33c52a4df3
Signed-off-by: Petr Reznicek <kecinzer@gmail.com>
Merge branch 'jb-mr1' of github.com:Root-Box/packages_apps_Mms into jb-mr1