Vendor kastore

[jeromekelleher]

Second attempt at simplifying C dependencies after #1958.

Closes #1687

[codecov]

Codecov Report

Merging #1973 (5661389) into main (b726017) will decrease coverage by 1.71%.
The diff coverage is n/a.

❗ Current head 5661389 differs from pull request most recent head 27a334c. Consider uploading reports for the commit 27a334c to get more accurate results

@@            Coverage Diff             @@
##             main    #1973      +/-   ##
==========================================
- Coverage   93.32%   91.60%   -1.72%     
==========================================
  Files          27       27              
  Lines       25212    26028     +816     
  Branches     1108     1342     +234     
==========================================
+ Hits        23530    23844     +314     
- Misses       1648     2133     +485     
- Partials       34       51      +17     

Flag	Coverage Δ
c-tests	92.32% <ø> (ø)
lwt-tests	89.14% <ø> (ø)
python-c-tests	71.68% <ø> (ø)
python-tests	98.80% <ø> (ø)

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Impacted Files	Coverage Δ
python/tskit/trees.py	78.02% <0.00%> (-19.78%)	⬇️

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[jeromekelleher]

I think this is ready to go - there will be some short-term pain for devs though as git gets confused about having/not having submodules.

[benjeffery]

Works well here and seems that meson dist also works. I added a changelog.

[jeromekelleher]

Great! Let's merge, no point in putting this one off.