The native String.replace method in extremely slow when we are
dealing with a large string and large quantity of strings to replace.
This new solution walks through the string looking for placeholders
to replace.
Instead of injecting the HTML + JS directly - return a promise that is resolve with
the HTML and JS. This gives the caller control over how and when to inject the nodes
in the DOM. Also modify templates.replaceNode functions to cleanup YUI events mess.
Also pass the context to the callback so it can be verified.
Also pass the arguments to the callback as a named array - not a flat argument list.
Also - only load external scripts if they are not already loaded.
When nodes are added to the dom, they may need to be re-processed by a JS based
filter. To do this we need to trigger the legacy YUI event filter-content-updated.
To make this easier I added some wrappers to template that will insert the node, run any
JS and trigger the event.
I also changed existing yui code to call the amd function to trigger the event. This way
all jquery and yui listeners will always be notified.
Now the db/service.php array can contain these extra keys to provide information
on how a webservice may be called:
'ajax' => true (Default is false)
Replaces the xx_is_allowed_from_ajax callback.
'loginrequired' => false (Default is true)
Means that this webservice can be called through lib/ajax/service-nosession.php
which sets NO_MOODLE_COOKIES to true (faster). This is only safe for webservices returning
static public data (e.g. get_string).
The first ajax load fetches the template and puts it in localstorage + a js var
The second load gets it from local storage, but does not put it in the js var.
The pix_icon helper expects it to be in the js var always.
