3.0.0 RC2

This release fixes several encoding/escaping bugs discovered by the expansion of parser tests, including the following:

• Repeated backslashes in argument strings no longer overload the regex engine with exponential backtracking.
• The [ character must now be escaped in any unquoted argument value (this allows the parser to correctly interpret [a=[b][/b] as a matched [b] preceded by the text [a=, rather than a dangling [a="[b"] followed by a dangling [/b]).
• Literal backslashes must now always be escaped.