Make Wrapper Around Executable

[evolvedmicrobe]

Goal here was to refactor the code to make it easy for us to call in our pipelines and use the intel MKL instead of the GPLed fftw library.

• Convert from a standalone executable to a set of init/step/free methods. Extract from the main class the load and run methods it calls, and place in a new file 10X_tsne.[h|cpp] a class that maintains state with a C++ class and has a TSNEStateclass which has initialization andstep_tsne_bymethod along with a destructor to free resources. This is mostly cut/paste, but I made a few changes (e.g. I added averbose` field to only print statements if requested.
• Define extern "C" interface to this library so it can be called from Rust.
• Avoid compiling the old cut/paste versions of the code with a #ifdef ORIGINAL_TSNE_PROGRAM but leave the files around to make it easier to compare things to the older state.
• Run clang-format on the changed files. This led to some churn but I think was worth it overall.