ENH: Add settings for manual choice of XC functionals for GGA, MGGA and hybrids

[BvB93]

cc @iinfant76

[codecov]

Codecov Report

Merging #356 (b29eee7) into master (0c716c1) will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #356      +/-   ##
==========================================
+ Coverage   81.30%   81.45%   +0.15%     
==========================================
  Files          26       26              
  Lines        1658     1672      +14     
  Branches      232      236       +4     
==========================================
+ Hits         1348     1362      +14     
  Misses        272      272              
  Partials       38       38              

Impacted Files	Coverage Δ
nanoqm/workflows/schemas.py	93.02% <ø> (ø)
nanoqm/workflows/input_validation.py	91.19% <100.00%> (+0.71%)	⬆️
nanoqm/workflows/templates.py	96.00% <100.00%> (+0.16%)	⬆️

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[BvB93]

@iinfant76 feel free to merge if you think it's ready.