Phase out /js/tooltip/*

Openfire uses an outdated set of javascript libraries to provide tooltips in the admin console. These libraries cause alarms in static analysis tools. They should be replaced.

With modern browsers, it’s rather easy to have a CSS-based replacement for these tooltips.

Note that the libraries provided by Openfire can also be used by plugins. When these do not contain their own copy of the library, their usage should be replaced too. This is known to be the case for the ClientControl plugin, the Monitoring plugin, the SIP plugin and the Asterisk plugin.