C++ patterns

C++ with Unicode identifiers.

• classes matches class definitions
• comments matches comments
• defines matches #define lines
• directives matches #-directives
• doc_comments matches Doxygen comments
• enums matches enumerations
• functions matches function definitions
• includes matches #include lines
• names matches identifiers (and keywords) not inside strings and comments
• namespaces matches namespace scopes
• strings matches strings
• structs matches struct definitions
• typedefs matches typedef lines
• zap_commands removes command keywords from matches
• zap_comments removes comments from matches
• zap_directives removes #-directive lines from matches
• zap_strings removes strings from matches