the "context" menu.
This new context menu is generated using the typical event processing
system, like our other menus. The specialized quick CSS and JS is now
gone, replaced by our generic menu handling code. It's all rolled
together currently using the thumb_menu UI for easy packaging. All
the CSS and JS is updated.
NOTE: the non-dialog links (rotate, album_cover) have a broken UI
because they return JSON which the quick.js code handled specially,
but we don't handle properly now. I need to fix this.
from using a single gQuickPane <div> that we move around. A race
condition happens when you mouse over two thumbnails quickly.
Whichever server response loses the race gets displayed, and sometimes
it's the one that you're no longer hovering over.
Fix it by changing gQuickPane to be a class and creating a <div> per
thumbnail.
Fixes ticket #290.
