Moved function SaveAs from SemGenGUI to new child class of
SemGenFileChoser: SemGenSaveFileChooser. All calls of 'SaveAs' now
create and call that class.
Save behavior is now specified by the individual tab classes.
Moved routine for initializing a SemSim Model from SemSimGUI to the
annotator workbench.
Encoder functions and task class moved to their own class. All users now
initialize and execute the new Encoder class.