This entailed a major rewrite of the composition handling from each engine and engine view along with the solver and primer. The intent here is to let Compositions be constructed from the same extensive property which the solver tracks internally. This addressed C0 discontinuity issues in the tracked molar abundances of species which were introduced by repeadidly swaping from molar abundance space to mass fraction space and back. This also allowed for a simplification of the primeNetwork method. Specifically the mass borrowing system was dramatically simplified as molar abundances are extensive.
Passing weak rate interpolator as an std::optional was resulting in use-after-free bugs due to std::optional making a copy of WeakRateInterpolator. This resulted in segfaults. Since we have the new construction semantics with flags this is no longer needed so the optional argument has been removed in favor of a simple const &
