ProcessorParserException: renamed to ArgProcessorParserException to simplify merge of "newagent" code.
ArgProcessorParserException, SnippetParserException, ScopeParserException: subclass the ParserException class.
Proc, ProcArgType, ProcMethod: renamed to ArgProcessor, ArgProcessorKind, and ArgProcessorMethod to simplify merge of "newagent" code.

Other classes updated to reflect the name changes.