[GDXHTML-6] Correct paramter modifiers for Mojo, and goal in execution module.
[GDXHTML-6] Add relevant dependencies.
[GDXHTML-6] Add parser abstraction.
[GDXHTML-6] Add annotations to replace isAbleToParse method
[GDXHTML-6] Implement isAbleToParse method by Annotation discovering.
[GDXHTML-6] Add stub for <head> section parser
Merge branch 'feature/GDXHTML-6_HTML_Abstraction' into develop

Conflicts:
	plugin/pom.xml
	pom.xml