* Improve output display of RunCommand The previous use of Debug for displaying `print` and `run` results was less than clear. * Avoid checking the types of vectors during trampoline construction Because DataValue only understands `V128` vectors, we avoid type-checking vector values when constructing the trampoline arguments. * Improve the documentation of the filetest `run` command Adds an up-to-date example of how to use the `run` and `print` directives and includes an actual use of the new directives in a SIMD arithmetic filetest.