Allow embedding of HTML content

[tehapo]

Allow embedding of HTML content in the XML layout.

One possible way to achieve this could be to parse the HTML content blocks into a separate templates creating a <div location="xyz"> for each Vaadin component inside the HTML. The created template could then be fed to a CustomLayout and all contained Vaadin components would be added to the CustomLayoutusing addComponent(component, "xyz") method.

Just an idea at this point that could be tested out.

[tehapo]

Oops.