Adapted some of the parsing artifacts to new APIs in attoparser
Merge branch 'merger' into 3.0-dev-dom2

Conflicts:
	src/main/java/org/thymeleaf/engine/markup/MarkupEngineConfiguration.java
	src/main/java/org/thymeleaf/engine/markup/parser/StandardHtmlParser.java
Adapted all parsers to new attoparser APIs.