Indent
Minor: move to base class
For #1363: remove PFC entry for XForms server and comment
Minor: indent
Implement #1907 "Option to output control tree as XML"

- add `host-language` property to configure XForms output
- add anyToCollectable
- move XHTML output from XFormsToXHTML to XHTMLOutput
- add XMLOutput
- improve XMLReceiverSupport
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