v3.8.20230412

• Added @parser::setAlignClasses()@ and @parser::isAlignClassesEnabled()@. This can be used to enable img alignment classes in XHTML output document mode, instead of the default align attribute.
• Added @parser::DOCTYPE_HTML5@ and @parser::DOCTYPE_XHTML@ constants. These can be used with @parser::setDocumentType()@ to specify the output document type.