Test problems

[vedantdhruv96]

Potential list of test problems that should be implemented:

• [x] Linear modes - 1D
• [x] Linear modes - 2D
• [x] Advection/ transport test
• [x] Orzsag-Tang vortex problem
• [x] Bondi inflow
• [x] Fishbone-Moncrief torus equilibrium
• [x] Kelvin-Helmholtz instability
• [ ] SOD shocktube
• [ ] Shu-Osher shock problem
• [ ] Komissarov shock problems
• [ ] Cylindrical blast wave
• [ ] Electrons: Hubble flow
• [ ] Electrons: Noh shock problem

[vedantdhruv96]

Some of these have been implemented in a local fork of mine and will be merged.