Add redundancies for custom operator parsers ":" and "."
Add redundancies for custom operator parsers ":" and "."

Just add character parsers for ':' and '.' so that
if someone uses it like: `a:@10` where `@` could be a custom
operator it would still process ':' correctly because
the operator `:@` would not be recognized.

cparse/cparse,bamos/cpp-expression-parser