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1. Drop support for `Python 3.5`
2. Make type equivalence check for string and ostream more robust (`is_std_string`, `is_std_wstring`, `is_std_ostream`, `is_std_wostream`)
3. Skip GCC's __va_list fields on AArch644
4. Add search_path arg to `find_xml_generator
5. Publish pygccxml as source distribution too