shiboken: Introduce DefaultValue

Introduce a small class storing the return value of
Generator::minimalConstructor() consisting of a type enumeration and a
value, offering formatting for the use cases variable initializations,
return values and constructor arguments lists.
Having distinct formatting for the different use cases has some
advantages:
- Can use nullptr without casts (except in constructor arguments
  lists, where the type is needed for disambiguation).
- In the previous implementation using a string, "" indicated an
  error; so, it was not possible to use it for default-constructors.
  It is now possible to handle default-constructors for
  initialization ("Foo f" instead of "Foo f = Foo()".
- Can use {} for return values.

Task-number: PYSIDE-62
Change-Id: I73229cb957d4b92b43de4cdbc3c66703f48faa61
Reviewed-by: Christian Tismer <tismer@stackless.com>

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