Add lookahead count when lazing loading carousel panel assets

[markcellus]

I'm debating on whether or not to add the ability to specify how many panels in advance to load when navigating a carousel.

[markcellus]

This would only apply to carousels who's panels are lazy-loaded (ones that use the lazyLoadAttr option)

[GwG422]

Are you daft ....you'll wake the dead sir...⚡⚡