cli: improved verbose mode, added --abstract-tree option for people who want to see that
lib: classes can now include Oozby::Geometry and get to make shapes in the usual way inside their methods!
lib: raise errors in a couple of places when incompatible data types are supplied to some openscad methods in the preprocessor

also make compatible with new environment
lib: improve oozby/base's backtraces and make it more compatible with new oozby/environment