Class Roo.Fx.slideOut

Slides the element out of view. An anchor point can be optionally passed to set the end point
for the slide effect. When the effect is completed, the element will be hidden (visibility =
'hidden') but block elements will still take up space in the document. The element must be removed
from the DOM using the 'remove' config option if desired. This function automatically handles
wrapping the element with a fixed-size container if needed. See the Fx class overview for valid anchor point options.
Usage:

// default: slide the element out to the top
el.slideOut();

// custom: slide the element out to the right with a 2-second duration
el.slideOut('r', { duration: 2 });

// common config options shown with default values
el.slideOut('t', {
    easing: 'easeOut',
    duration: .5,
    remove: false,
    useDisplay: false
});