clients: support async page fetching #614
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An async fetch replaces a section of the page with content without full
page reload. Example syntax:
--form--
type="action" value="/remote/resource"
type="submit" label="Submit Invoice"
type="asynctarget" value="section_one"
--/form--
--section id=section_one --
--/section--
When the form is submitted, brclient/bruig fetches the contents of
/remote/resource, then replaces everything inside #section_one with it.
Sections and forms should not be nested (that is unsupported).