Changed
- Object Types listed in `project_objects_ids` are now automatically added to the Execution package.
- Those objects don't have to be based on `Generic`, actually the file may contain whatever (no need for a class with name corresponding to the name of the module / Object Type).
- All scene objects are downloaded prior to trying to find their predecessors. This will allow importing code from one Object Type into another.
- Cross-importing should be done only between OT listed in scene or objects listed in `project_objects_ids` - OT should not import something from another OT predecessor, as this situation can't be figured out.
- All changes are fully backwards compatible.