Release workflow update

[mducle]

Updates release.py script to create an automatic release (work was done in June but due to time pressure for the SpinW training course, the v4 release of SpinW was done manually).

Also adds files to create a Matlab toolbox (mltbx file).

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 42.65%. Comparing base (89c63fa) to head (98a0af8).
Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
swfiles/sw_mex.m	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
+ Coverage   42.14%   42.65%   +0.50%     
==========================================
  Files         240      241       +1     
  Lines       16091    16253     +162     
==========================================
+ Hits         6782     6933     +151     
- Misses       9309     9320      +11     

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[github-actions]

Test Results

    4 files  ±0    116 suites  ±0   5m 27s ⏱️ +6s
  733 tests ±0    715 ✅ ±0  18 💤 ±0  0 ❌ ±0 
2 104 runs  ±0  2 068 ✅ ±0  36 💤 ±0  0 ❌ ±0 

Results for commit 98a0af8. ± Comparison against base commit d859b68.

♻️ This comment has been updated with latest results.

[RichardWaiteSTFC]

Thanks for this, have checked matlab toolbox can be installed (great to have this automated). Just a couple of questions to help me understand what's going on!

[RichardWaiteSTFC]

Thanks for this - really appreciate the dev docs as well!

[RichardWaiteSTFC]

Thanks for this - really appreciate the dev docs as well!