SIMBI v0.2-alpha

Refactored 2D SR and it's quite fast at ~2.3 Mzps for RK1. Will refactor other parts later down the road.

-- Made read_jet.py easier to plot on the fly
-- std::vector<std::vector<...>> -> structs and 1D vecs
-- Modified Newton-Raphson to converge at a rate of ~1.5 instead of standard 1.414 rate