region fx plugin tweaks

Reduces the cookie lifetime for fxTabs and fxAccordion from 30 days to 3. There was no point in holding it for so long. All it does is hold the visibility state.

Adds contextual a class for transition state in fxAccordion. Since the animation can cover large areas, any css effects like box shadows can kill performance. The contextual class can be used to temporarily hide any blending effects improving the redraw speed. This is used in Canvas for the dashboard region. Also adds a contextual class when any block is expanded. Can be used for fancy effects. The classes are applied to the body element like so.. REGION_ID-in-transition & REGION_ID-is-activated.

Also removes the RTL styles for fxAccordion. It was not needed and caused problems.