v0.2.0

Summary

No API changes compared to v0.1.0.

This version refactored the code base to prepare for future development.

Enhancement Details

• Support using pybind11 to bind simulation object to Python. (-DUSE_PYBIND11=ON/OFF)
• Refactor the code base to make future development and adding new data structure easier.
• Do unit testing (googletest) and memory profile (valgrind).
• Use doxygen to document the code.
• Use clang-format and cmake-format to format the code.