`AsterX` dependency in `AsterSeeds`

[jaykalinani]

`AsterX` dependency in `AsterSeeds`

[SamuelCupp]

For now, I'm adding a thorn to my repo (not pushed to remote yet) that provides the same functionality as AsterSeeds but depends on GRHayLET. Since I'm not doing magnetic fields yet, I don't have to worry about Avec, and it doesn't depend on GRHayLHDX. I have tried to prune the code and make it more like I want it to look.

Right now it only has the 1D tests, but it does the switching of test types and directions in a cleaner way (in my opinion). I also split the hydro and Avec ID into two different functions, though all the actual Avec code is commented out. This is so we could have pure hydro ID for cases where a code doesn't evolve magnetic fields.

If we get to a point where we want to only have one version, we can talk about which thorn seems to be in a better state and make a single ID thorn.