Support inline comments in input files

[lhearachel]

Input files should be able to correctly tokenize and ignore an inline-comment. For simplicity, block-style comments (e.g. C's /* */) will not be allowed.

Inline-comments should be demarcated by a prefix token (to be decided on) and extend until the end of the input line. This content may either be stripped from the output or kept as an inline comment on enumerator definitions and preprocessor directives.