navis-org/fafbseg-py: Versino 1.4.0

Improvements to FlyWire interface:

• new/improved functions to pull/use the L2 cache (e.g. flywire.l2_dotprops and flywire.l2_info)
• new functions to interact with annotation tables (e.g. flywire.get_annotations and flywire.create_annotation_table)
• all synapse queries now use the annotation framework (instead of the Itanna service on spine)
• flywire.skeletonize_neuron now uses the nucleus segmentation to identify somas (see also flywire.get_somas)
• various small fixes and improvements