Raillabel

- LoaderUnderstandAi now includes warnings for duplicate annotation id and duplicate frame id
- LoaderRaillabel now includes a warniing for duplicate frame id

- LoaderUnderstandAi now passes the warnings from the LoaderRaillabel onto the user
- LoaderUnderstandAi.load() validate parameter defaults to False now

- Removed deprecated features
- Annotation classes now contain information about the object they annotate
- Removed ObjectData - frames now directly contain the annotations
- name field in annotation classes now is automatically generated
- Separated frame_data and object_data in the schema and devkit
- frame_data can only contain Num instances
- object_data can not contain Num instances anymore
- Major restructuring of the project directories
- FrameInterval.from_frame_uids(): create FrameIntervals by providing a list of frame uids
- Object.object_data_pointers(): generate ElementDataPointers
- Scene.frame_intervals(), Object.frame_intervals(): generate FrameIntervals
- Object.asdict() now provides also frame intervals and object data pointers, if the frames from the scene are provided
- Scene.fromdict() for loading a scene from a dictionary

- Support for additional, undefined attributes in raillabel.format.Metadata

- Fixed bug, that prevented loading a understand ai file via raillabel.load()
- Made the project_id field in the understand ai files less restrictive

- Raillabel schema is now more restrictive regarding intrinsic calibration
- Support for understand.ai t4 format
- Renaming of raillabel.format.Frame.data to frame_data