Renamed AbstractGrammar, ConcreteGrammar, and PhysicalLayer (as seen in
this list) to respect CamelCasing. Removed generation suppression
(@generated NOT) from constructors in PositionImpl and SizeImpl; enabled
(temporarily) model-wide public constructors in itml.genmodel so that
all generated classes can be used from plugin without modification.
Further modifications to plugin to use factories is required. Disabled
generation of AbstractGrammar editor in resulting plugin in
itml.genmodel.