Fix-legacy, put more in base readers

[tlambert03]

No description provided.

[codecov-commenter]

Codecov Report

Merging #10 (636349d) into main (35fa068) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff          @@
##            main     #10   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          8       8           
  Lines        863     839   -24     
=====================================
+ Misses       863     839   -24     

Impacted Files	Coverage Δ
nd2/_legacy.py	0.00% <0.00%> (ø)
nd2/_util.py	0.00% <0.00%> (ø)
nd2/nd2file.py	0.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 35fa068...636349d. Read the comment docs.