Implement TabArray class

[PromyLOPh]

I’ve tested it with pangocairocffi and it works.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (c4fa079) 99.25% compared to head (77ad71d) 98.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
- Coverage   99.25%   98.90%   -0.36%     
==========================================
  Files          19       20       +1     
  Lines         940     1004      +64     
==========================================
+ Hits          933      993      +60     
- Misses          7       11       +4     

Files	Coverage Δ
pangocffi/__init__.py	86.04% <100.00%> (+0.33%)	⬆️
pangocffi/enums.py	100.00% <100.00%> (ø)
pangocffi/tabarray.py	97.87% <97.87%> (ø)
pangocffi/layout.py	97.24% <62.50%> (-2.76%)	⬇️

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[leifgehrmann]

Nice work! I've tested that these changes works locally and this all looks good to me. There's some lines of code not covered, but it's nothing significant that should stop this code from being merged in.

I've also run the GitHub actions and they seem to have failed for reasons that are likely unrelated to your changes. It's been a while since they have been run, so I'll do a quick investigation first why they might be broken. I'll be merging this in today even if I don't figure it out.

Hopefully I'll be able to make a release by tomorrow.

[PromyLOPh]

Thanks! I see my tests were somewhat lacking, sorry about that :(