completely rewritten parser

[Jutho]

No description provided.

[codecov]

Codecov Report

Merging #71 into master will increase coverage by 0.93%.
The diff coverage is 77.9%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   79.51%   80.45%   +0.93%     
==========================================
  Files          13       18       +5     
  Lines        1333     1422      +89     
==========================================
+ Hits         1060     1144      +84     
- Misses        273      278       +5

Impacted Files	Coverage Δ
src/TensorOperations.jl	94.11% <100%> (-0.2%)	⬇️
src/indexnotation/optdata.jl	42.85% <42.85%> (ø)
src/indexnotation/preprocessors.jl	55.35% <55.35%> (ø)
src/indexnotation/tensormacros.jl	57.69% <57.69%> (ø)
src/indexnotation/optimaltree.jl	93.85% <66.66%> (+0.03%)	⬆️
src/indexnotation/analyzers.jl	77.16% <77.16%> (ø)
src/indexnotation/verifiers.jl	82.41% <82.41%> (ø)
src/indexnotation/instantiators.jl	86.36% <86.36%> (ø)
src/indexnotation/ncon.jl	90.38% <86.95%> (ø)
src/indexnotation/parser.jl	91.66% <91.66%> (ø)
... and 11 more

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