WIP: Word problem solver

[markuspf]

Work in progress PR for word problem solver.

[codecov]

Codecov Report

Merging #22 into master will decrease coverage by 53.99%.
The diff coverage is 10.16%.

@@            Coverage Diff            @@
##           master      #22     +/-   ##
=========================================
- Coverage   90.88%   36.89%    -54%     
=========================================
  Files          22       20      -2     
  Lines        2458     1732    -726     
=========================================
- Hits         2234      639   -1595     
- Misses        224     1093    +869

Impacted Files	Coverage Δ
gap/place.gd	100% <100%> (ø)	⬆️
gap/walrus.gi	10.71% <2.27%> (-84.85%)	⬇️
gap/place.gi	31.94% <28.57%> (-61.29%)	⬇️
gap/anadata.gi	9.58% <0%> (-89.05%)	⬇️
gap/pregroupconstr.gi	11.11% <0%> (-84.73%)	⬇️
gap/presentation.gi	26.81% <0%> (-67.33%)	⬇️
gap/util.gi	28% <0%> (-64%)	⬇️
gap/relator.gi	39.04% <0%> (-54.29%)	⬇️
gap/pregroup.gi	33.69% <0%> (-49.05%)	⬇️
... and 6 more