JavadocHelper: Support Automatic-Module-Name for Javadoc URL lookup

[NicolaIsotta]

When resolving module-prefixed Javadoc URLs for libraries lacking a module-info.class, JavadocHelper now checks also the jar manifest for Automatic-Module-Name. This allows automatic modules without an explicit module-info.class to correctly resolve module-prefixed Javadoc paths.

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[NicolaIsotta]

To test:

• create a java maven project
• add omnifaces 4.7.10 as a dependency
• from the project tab, expand the "Dependecies" node
• Right click the omnifaces node and click "Download Javadoc"
• Open the node, open a package and right click a .class file
• Choose "Show Javadoc" from the context menu

On NB30 a toast notification will appear, stating the no javadoc was found.
With the PR applied, the javadoc should be opened correctly