Merge pull request robotpy#81 from robotpy/extern-c

Fix extern C and add option to remove preprocessing

Merge pull request robotpy#80 from robotpy/ref-qualifiers

Add support for parsing ref-qualifiers

Merge pull request robotpy#79 from stephen-hansen/decimal_char_enum_fix

Fix enum parsing bug regarding decimal digit characters

Doxygen comments were being discarded when an attribute was encountered

Merge pull request robotpy#78 from robotpy/more-madness

More madness

Merge pull request robotpy#74 from robotpy/constexpr-fn

support constexpr functions

Merge pull request robotpy#71 from davidcaron/add-access-property-to-…

…using

Add access property to 'using' CppVariable

Merge pull request robotpy#67 from Erignik/fix_function_point

Add function pointer parse.

Merge pull request robotpy#64 from wflohry/sameid

Fixing type reference to self

Merge pull request robotpy#62 from robotpy/typename

Various fixes for 'using'