Feature/gui validation

[RoaldL]

This pull request suggests a system to allow validation in the user-interface. The idea is to design validation methods that can both be used to validate the smif config during runtime and when the datainterface is used to write/update configurations.

[codecov[bot]]

Codecov Report

Merging #232 into develop will decrease coverage by 1.7%. The diff coverage is 61.74%.

@@             Coverage Diff             @@
##           develop     #232      +/-   ##
===========================================
- Coverage    83.08%   81.37%   -1.71%     
===========================================
  Files           50       52       +2     
  Lines         3771     4531     +760     
  Branches       454      684     +230     
===========================================
+ Hits          3133     3687     +554     
- Misses         572      750     +178     
- Partials        66       94      +28

Flag	Coverage Δ
#javascript	81.37% <61.74%> (-1.71%)	:arrow_down:
#python	86.9% <67.64%> (-2.96%)	:arrow_down:

Impacted Files	Coverage Δ
src/smif/data_layer/data_interface.py	96.91% <ø> (+1.16%)	:arrow_up:
...pp/src/components/ConfigForm/SosModelConfigForm.js	15.21% <0%> (-6%)	:arrow_down:
src/smif/exception.py	100% <100%> (ø)	:arrow_up:
src/smif/data_layer/datafile_interface.py	86.84% <55.55%> (+1.05%)	:arrow_up:
src/smif/http_api/crud.py	89.78% <65.78%> (-4.88%)	:arrow_down:
src/smif/data_layer/validate.py	31.68% <67.85%> (-68.32%)	:arrow_down:
src/smif/metadata/spec.py	99.15% <0%> (-0.85%)	:arrow_down:
src/smif/data_layer/memory_interface.py	95.91% <0%> (-0.32%)	:arrow_down:
src/smif/model/model.py	100% <0%> (ø)	:arrow_up:
... and 13 more

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