This patch replaces backslash characters in the generated jQuery
plugin URL to forward slashes when slasharguments is disabled and
the Moodle server is running on IIS.
Thanks to Ryan Panning <Ryan.Panning@district196.org> for
reporting this issue and for suggesting a fix.
In several places we only want to output a certain bit of HTML (e.g. the
contents on the mod chooser) once per page.
This used to be done with a static variable in the function, which
meant the logic was once per PHP-script execution, not once-per-page.
Now there is a new bit of API in page_requirements_manager to handle
this properly.