Support for parsing optional properties (class & interface)

[ondratra]

This merge adds new flag optional to PropertyDeclaration.
It is true for TS properties defined optional e.g. { myProperty?: string }

[codecov-io]

Codecov Report

Merging #80 into develop will increase coverage by 0.01%.
The diff coverage is 50%.

@@ Coverage Diff @@ ## develop #80 +/- ## =========================================== + Coverage 90.22% 90.23% +0.01%  =========================================== Files 63 63 Lines 972 973 +1 Branches 192 172 -20 =========================================== + Hits 877 878 +1  Misses 88 88 Partials 7 7

Impacted Files	Coverage Δ
src/node-parser/interface-parser.ts	92% <ø> (ø)	⬆️
src/node-parser/class-parser.ts	94.36% <ø> (ø)	⬆️
...ators/typescript-generators/propertyDeclaration.ts	60% <0%> (ø)	⬆️
src/declarations/PropertyDeclaration.ts	100% <100%> (ø)	⬆️

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[ondratra]

I am not sure what caused fail check in CI. @buehler can you please check this pull request and accept it if possible, please? (or tell me what is wrong)

[buehler]

Good idea!
Nice, but there are tests missing ;-) maybe that is why the codecov check fails. Can you add a test for an optional property?

[ondratra]

Yes I can :) I am just little bit confused where to put the tests' code. Can you tell me how to create new test in project's structure? (/test folder seems quite complex to me :) )

[buehler]

I can and I will, but first I'm gonna finish my holiday :-) I'll be back in 1 week.

[buehler]

hmm I could add the PR and add the tests by myself so you get an example. I'll write the reference in this PR as a response for you.

[buehler]

@ondratra #84