Still need to generalize TabFuncParams and TabFuncData and work the neural net into the existing EoS framework

- Moved get_var_index to ManifoldFunc.H instead of EosParams.H
- Shortened get_var_index arglist

- Still need to calculate source terms
- Still need to account for variables passed to input layer
- Maybe we can worry about GPUs later

- This style of manifold will print all of the metadata properly, but SEGFAULTs at some point in EosEval/main.cpp

…s optional

Combined Source Term lookups

…cs into kiraneiden/manifold