Update cmake & clang tidy & rewriting binary read-in

[landinjm]

This is going to be a big pull request, but it's morphed into something I can't split up easily right now. Nonetheless, I'll try and explain everything I've done well.

Binary read-in

I finally got around to looking at the code in #691 after fixing some CMake stuff that lets up run unit tests from the main directory. I found out that the feature didn't support vector fields. I decided to rewrite it. Here's a shortlist of what I did

• Improved documentation, so it's a bit more clear
• Vector fields are fully supported for all dimensions
• Added some more assertions for the mesh types that support binary read-in and the fact that only one field is supported
  Check out In read_binary.h allow for widening and narrowing of types #707 for a feature we should probably add.

Clang-tidy

This is still a WIP, but I've been working on getting that workflow to pass.

Closes #698

CMake

This is the bulk of the work I did.

• We no longer rely on the macros that deal.II provides.
• The core library is actually a library now (we don't have an install target).
• The core library has a make run_tests target that runs the unit tests
• Applications have make debug, make release, and make debugrelease targets to compile the debug executable, release executable, and both. Note that the release executable has been renamed from main -> main-release
• I've rewritten the regression test script so it prints things nice and no longer has a running tally of the timings. The GitHub CI is more than enough to observe trends in performance over time.
• The regressions tests can also be run with make install when configured
• All applications can be compiled with make install when configured
• I removed some applications that were being developed in the regression tests. These should be in their own repo now that we're a library.

Closes #533, #390, #688, #527, #706, #681, #668, #390, #314