rewrite visibility checking to be more generic/cleaner as well as add functionality to check if the element is scrolled on screen for more intuitive paste-target selection

updated how tabs are presented in DOM with Gradio 3.23.

rework of hypernets: rather than via settings, hypernets are added directly to prompt as <hypernet:name:weight>

add checkpoint hash to footer

I moved a preset manager into quicksettings, this function
was targeting my component instead of the tabs. This is
because class tabs is autoassigned, while element id #tabs
is not, this allows a tabbed component to live in the quicksettings.

This makes sure it will work everywhere

And duplicate implementations are removed

refactored image paste handling to fill unset images successively, then replace last existing image (fixes #981)

add an option to disable lightbox modal