scimoz: move text-and-length function logic from js to npapi
http://bugs.activestate.com/show_bug.cgi?id=100661

(integrated from komodo (trunk) change 82498 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13799 b87d16e7-d29f-4ee1-b5ec-817d645d335f