Updated and finished removal of ExternalForm (and related classes)
The task I assigned myself a couple of weeks ago is complete. ExternalForm is no longer in EToys, and (as much as possible) support for it has been factored out of Form. The classes are now in http://www.squeaksource.com/Balloon3D, in the package GraphicsExternal*. These classes should still work if just filed into a current image with all of the packages applied. Further, the test associated with this class have been removed from FFI and placed into the same package noted above.
To finalize this, these two packages should be moved to Trunk after you are satisfied that work as advertized:
(the last 2 are now correctly in the Balloon3D repository)
(*I looked into packaging these are Graphics-External as Andreas did, but the significant difficulty of not messing up the host windows packages in the Ffenestri sub-package made me toss the towel in and go with the simpler packaging)