Expand fpp-to-json tests

[jwest115]

Run fpp-to-json on fpp-check test cases to improve code coverage.
Update trace file to prevent crashes when running the fpp-to-json native build.

Closes #468.

[bocchino]

Looks good! I refactored the new fpp-to-json/fpp-check tests a bit. I moved those tests to a subdirectory. I used find instead of iterating over directories to find the fpp-check test input files. It's more efficient, and it finds files at all directory levels; before we were only going down one level. I revised the format of the test output so that the longer test names don't crash into the PASSED or FAILED output.

I also ran dostounix on the top-level source file for fpp-to-json. There were some stray ^M characters in there, probably from back when the file was created.