Refactor for a future with multiple discretization strategies

[xtalax]

Make way for the stencil interface discretization strategy

[codecov]

Codecov Report

Merging #185 (f4618bf) into master (f57c44e) will decrease coverage by 15.90%.
The diff coverage is 71.18%.

@@             Coverage Diff             @@
##           master     #185       +/-   ##
===========================================
- Coverage   84.67%   68.76%   -15.91%     
===========================================
  Files          33       35        +2     
  Lines        1664     1681       +17     
===========================================
- Hits         1409     1156      -253     
- Misses        255      525      +270     

Impacted Files	Coverage Δ
src/interface/solution/MOLMetadata.jl	88.88% <ø> (-11.12%)	⬇️
src/system_parsing/interior_map.jl	91.60% <57.14%> (-8.40%)	⬇️
src/scalar_discretization.jl	66.66% <66.66%> (ø)
src/MOL_discretization.jl	59.63% <88.88%> (-5.34%)	⬇️
src/discretization/generate_ic_defaults.jl	86.66% <100.00%> (-6.67%)	⬇️
src/interface/MOLFiniteDifference.jl	90.00% <100.00%> (ø)
src/interface/disc_strategy_types.jl	100.00% <100.00%> (ø)
src/interface/solution/timeindep.jl	0.00% <0.00%> (-100.00%)	⬇️
...tization/schemes/half_offset_centred_difference.jl	0.00% <0.00%> (-100.00%)	⬇️
...schemes/nonlinear_laplacian/nonlinear_laplacian.jl	41.93% <0.00%> (-58.07%)	⬇️
... and 15 more

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