g:cpp_experimental_template_highlight failing tests

[lucianposton]

g:cpp_experiemental_template_highlight has several failures in the included tests. Failures are circled in red in the after screenshot below.

Note, g:cpp_experimental_simple_template_highlight is failing also, but I assume that's intended based on the notes in the test file.

Before:

After:

[MuAlphaOmegaEpsilon]

This is still a problem. It seems like g:cpp_experimental_template_highlight doesn't highlight the template arguments, while g:cpp_experimental_simple_template_highlight doesn't highlight the templated class.