Feature/90 generate known types

[Sevitas]

Motivation

Fixes #90

Checklist

• [ ] Code follows coding conventions held in this repo
• [ ] Automated tests have been added
• [ ] Tests are passing
• [ ] Docs have been updated (if applicable)
• [ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

Generate extended models, everything else should work as before

[codecov[bot]]

Codecov Report

Merging #148 (9e1fb6e) into master (d978779) will increase coverage by 1.43%. The diff coverage is 91.05%.

@@            Coverage Diff             @@
##           master     #148      +/-   ##
==========================================
+ Coverage   88.21%   89.64%   +1.43%     
==========================================
  Files          25       31       +6     
  Lines         840     1024     +184     
  Branches       76      102      +26     
==========================================
+ Hits          741      918     +177     
- Misses         83       87       +4     
- Partials       16       19       +3     

Impacted Files	Coverage Δ
...o.Kontent.ModelGenerator.Core/CodeGeneratorBase.cs	51.89% <0.00%> (+2.53%)	:arrow_up:
...Generators/Class/DeliveryClassCodeGeneratorBase.cs	100.00% <ø> (ø)
src/Kentico.Kontent.ModelGenerator/Program.cs	84.70% <81.48%> (+0.83%)	:arrow_up:
...t.ModelGenerator.Core/DeliveryCodeGeneratorBase.cs	84.00% <84.00%> (ø)
...or.Core/Generators/Class/BaseClassCodeGenerator.cs	92.45% <87.50%> (-1.78%)	:arrow_down:
...Core/Helpers/ContentTypeToDeliverTypeNameMapper.cs	89.28% <89.28%> (ø)
...delGenerator.Core/ExtendedDeliveryCodeGenerator.cs	89.70% <89.70%> (ø)
...Generator.Core/Common/ClassCodeGeneratorFactory.cs	100.00% <100.00%> (ø)
...tent.ModelGenerator.Core/Common/ClassDefinition.cs	100.00% <100.00%> (ø)
...ico.Kontent.ModelGenerator.Core/Common/Property.cs	97.70% <100.00%> (+1.09%)	:arrow_up:
... and 10 more

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[Sevitas]

Chages:

• introduced bool parameter -e for generating extended delivery models using MAPI
  • generates linked items element with type set to:
  • allowed type if exactly one is set
  • ContentItem otherwise
• introduced bool parameter -r for generating extended preview delivery models using MAPI, -e needs to be set to true as well
  • generates linked items element with type set to ContentItem in every case
• ContentItem type representing base type for every model, including only system property
• refactorings

note: Naming is not final