Complete the removal of the embedding stuff. Maybe. It's hard to be sure we got every...

Complete the removal of the embedding stuff. Maybe. It's hard to be sure we got everything, but this does compile, and it seems to work at least reasonably well. Any problems should of course be reported to the list.

For the record, this developer is sorry that the problems with this code were not noticed much earlier. It's not fun to do so much work and then have it all reverted.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@24373 a592a061-630c-0410-9148-cb99ea01b6c8