Add escapeHtml parameter to all DataBoundTokenMacro implementations

[rsandell]

This adds escapeHtml parameter to all macros extending from DataBoundTokenMacro i.e. any macro that takes a parameter. Any HTML content will be escaped with StringEscapeUtils.escapeHtml.
The implementing macro doesn't need to care by default about this parameter, but can do the escaping by itself by overriding handlesHtmlEscapeInternally and returning true.

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[rsandell]

@slide thanks for merging! Any chance to get it released? I think the CD release only kicks off if release drafter finds something interesting e.g. labeld with feature, bug etc.

[rsandell]

Email Ext follow up: jenkinsci/email-ext-plugin#359

[slide]

Yes, I will do it today.