Pygenstub

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- Fix signature alias parsing.

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- Drop support for Python 2, 3.4, and 3.5.
- Generate PEP-526 style variable annotations.
- Support type annotations for ``*args`` and ``**kwargs``.

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- Fix error when input path is absolute and an output directory is given.

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- Generate stubs for multiple input files.
- Generate stubs for directories.
- Generate stubs for modules.
- Add option for storing stub files in an output directory.
- Add option to generate generic stubs.

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- Support names renamed with as during import.
- Support class variables.

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- More spacing fixes for consecutive class stubs.