allow a properties HTML section to be used in the camel.palette file for an endpoint so a custom editor can be used

Using HTML would allow folks to define simple forms with input fields, check boxes, radio boxes, combo boxes and validation markup so folks could do basic validation of fields for custom endpoints.

Those fields would be populated from the <endpoint uri="foo:bar?a=1&b=2"/> configuration. Then updating the values in the form would update the URI in the XML etc.

Later on we could let folks define Java code in an eclipse plugin and refer to it from the XML; though in the mean time a simple HTML form should do the trick