Get unit tests passing on Linux

[lemming104]

1. Tweak casing on UMAPINFO test
2. Disable ticker nanosecond test; this does not work on WSL and probably never will
3. Use consistent casing in WAD files embedded in zips. Always use .WAD, not .wad.
4. Adjust tests to agree with (3) above

With these changes, the dotnet test command returns a passing result on WSL Ubuntu. It also still passes on my normal Windows environment.