8164316: Refine the Doclet APIs
Reviewed-by: jjg

8159305: Enhance the javadoc tool to support module related options
Reviewed-by: bpatel, jjg

8152054: fix @ignored langtools/test/jdk/javadoc/tool/ tests
Reviewed-by: jjg

8035473: [javadoc] Revamp the existing Doclet APIs
8146529: Update the new Doclet API
8146427: "-nohelp" option issue
8146475: "-helpfile" option issue
Reviewed-by: alanb, bpatel, ihse, jjg, jlahoda, mchung, ogb, vromero