Do not create intermediary types for array elements

[RedX2501]

The generator will create intermediary types even when the element is only an array:

element book
  complextype
    sequence
      element contents
        complextype
          element content type content maxBound unbounded
    sequence
  complextype

would generate

class book {
    container <content> contents;
}

class bookContent {
    container<content> contents;
}

class content  {
}

With this patch an option GenerateComplexTypesForCollections is introduce. By default it is false and would produce the following code:

class book {
    container <content> contents;
}

class content  {
}

[codecov]

Codecov Report

Merging #107 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   97.13%   97.14%   +<.01%     
==========================================
  Files          17       17              
  Lines        2964     2974      +10     
==========================================
+ Hits         2879     2889      +10     
  Misses         85       85

Impacted Files	Coverage Δ
XmlSchemaClassGenerator/TypeModel.cs	96.93% <ø> (ø)	⬆️
XmlSchemaClassGenerator/GeneratorConfiguration.cs	95.31% <100%> (+0.07%)	⬆️
XmlSchemaClassGenerator/Generator.cs	76.08% <100%> (+0.53%)	⬆️
XmlSchemaClassGenerator/FileOutputWriter.cs	100% <100%> (ø)	⬆️
XmlSchemaClassGenerator/ModelBuilder.cs	100% <100%> (ø)	⬆️

---

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[codecov]

Codecov Report

Merging #107 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   97.13%   97.14%   +<.01%     
==========================================
  Files          17       17              
  Lines        2964     2974      +10     
==========================================
+ Hits         2879     2889      +10     
  Misses         85       85

Impacted Files	Coverage Δ
XmlSchemaClassGenerator/TypeModel.cs	96.93% <ø> (ø)	⬆️
XmlSchemaClassGenerator/GeneratorConfiguration.cs	95.31% <100%> (+0.07%)	⬆️
XmlSchemaClassGenerator/Generator.cs	76.08% <100%> (+0.53%)	⬆️
XmlSchemaClassGenerator/FileOutputWriter.cs	100% <100%> (ø)	⬆️
XmlSchemaClassGenerator/ModelBuilder.cs	100% <100%> (ø)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[mganss]

👍 This should fix #32. Can you add a test case (perhaps using the xsd linked from #32)?