rename *_gmt_matrix to *_mt_matrix for cases not specific to the geometric product

[eric-wieser]

Extracted from a branch of Hugo's

[codecov]

Codecov Report

Merging #419 (b7ff9a6) into master (8b1428c) will increase coverage by 0.10%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
+ Coverage   71.29%   71.39%   +0.10%     
==========================================
  Files          73       73              
  Lines        9461     9461              
  Branches     1313     1313              
==========================================
+ Hits         6745     6755      +10     
+ Misses       2544     2535       -9     
+ Partials      172      171       -1     

Impacted Files	Coverage Δ
clifford/tools/g3c/__init__.py	61.81% <50.00%> (ø)
clifford/__init__.py	85.62% <100.00%> (ø)
clifford/_layout.py	96.95% <100.00%> (ø)
clifford/test/test_g3c_tools.py	82.25% <0.00%> (+0.82%)	⬆️
clifford/tools/g3c/model_matching.py	42.77% <0.00%> (+1.20%)	⬆️

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