v0.2.0

• The build system is updated and dependencies are handled by CMake.
• Header and source files are separated.
• OpenBLAS is added as an alternative to MKL BLAS.
• NASOQ Step is added.
• API and examples for SoMod are added.
• Tested across Mac, Linux, and Windows.
• README and docs are updated.

Header only version

This version is close to the SIGGRAPH20 paper (fb78297) with some fine-tuning. This release has the code in header files.