Changes

• Added new Markdown parser (for GitHub Flavored Markdown). Markdown can now contain tables and some other new things.
• Added data parser for plain text files (*.txt). (The string contents are just returned as-is.)
• markdown is now a module instead of a function.
• toml and json are now aliases for their .parse() functions.
• XML module: Added functions: xml.decodeEntities()
• XML module: Added settings: xml.htmlAllowNoAttributeValue, xml.htmlScrambleEmailAddresses