HLLC solver implemented

I have successfully implemented an HLLC solver into my 1D hydro code. I decided to go with HLLC instead of HLL since it does a better job of resolving contacts. All the plots from the test runs are consistent with Toro. I posted the test 1 plot for density to show how the HLLC solver can actually sometimes do better than the exact solver. More specifically, it does a better job of resolving that entropy "glitch" inside the left rarefaction. The comparison plots are on my buildcode page at the very bottom.

I'm now working on a Roe solver, and after that is finished I will add some documentation about these two approximate solvers to my buildcode page.

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