We already have the data for this, so this seems like a useful thing to do.  However, neither of the new tests currently pass...

This reveals that both HermesText and HermesBinary fail.  HermesBinary would have failed on master, too, if this had been implemented.

Before, the file just existed as the source code for HermesBinary.cpp, but we can test that things assemble correctly too (compare DSPTestBinary.cpp and DSPTestText.cpp).

A bit of jank is needed due to MSVC limitations (see https://docs.microsoft.com/en-us/cpp/error-messages/compiler-errors-1/compiler-error-c2026?view=msvc-170).

SPDX standardizes how source code conveys its copyright and licensing
information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX
tags are adopted in many large projects, including things like the Linux
kernel.

- Moves all test code from DSPTool into UnitTests/Core/DSPAssemblyTest.
- Converts test files (which could only be loaded if they were in the
  shell's working directory, so basically never) into C++ values.
- Enables most of the commented-out tests.
- Removes non-deterministic random code test.