Update and complete the signature module

There is now an external typing module for Python 2.7 and Python 3.6
from Guido (PSF license again) that makes the differences between
both versions vanish.

Also, when generating interface files, some types did not show
correctly, and the constant "0" is wrong in almost all cases.

Values in signatures looked often bad since they have no nice
__repr__, and it was almost impossible to create correct .pyi files.
Now, these instances are created as wrapped string types
with a nice __repr__. A call of these objects creates the real
constant. This way, also objects can be rendered which are
dependent from the existence of other objects (i.E. QPixMap).

This patch improves the usability of the signature module.
We can now generate source code or .pyi files without modifications.

Task-number: PYSIDE-510
Change-Id: I55490d76a29fc6c0e4f821c0c77d5e5d1e28976e
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

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