general cleanup, full legacy support

[tlambert03]

No description provided.

[codecov-commenter]

Codecov Report

Merging #5 (bba1fea) into main (091872c) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##            main      #5    +/-   ##
======================================
  Coverage   0.00%   0.00%            
======================================
  Files          5       8     +3     
  Lines        516     848   +332     
======================================
- Misses       516     848   +332     

Impacted Files	Coverage Δ
nd2/__init__.py	0.00% <0.00%> (ø)
nd2/_chunkmap.py	0.00% <0.00%> (ø)
nd2/_legacy.py	0.00% <0.00%> (ø)
nd2/_sdk/__init__.py	0.00% <0.00%> (ø)
nd2/_util.py	0.00% <0.00%> (ø)
nd2/_xml.py	0.00% <0.00%> (ø)
nd2/nd2file.py	0.00% <0.00%> (ø)
nd2/structures.py	0.00% <0.00%> (ø)

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