This is used when changing directories in the 'add game' dialog or when
choosing another tab in the option dialog. Only blit to the overlay on
the final pass. Gets rid of highly annoying flickers on androids
Formerly there was much special handling for the Tooltip dialog in
GuiManager::runLoop. This was replaced by overloading the event handling
functions in Tooltip. Also the Tooltip was adapted to be run like every
other normal dialog.
svn-id: r54337
Before, it could be instantiated after an engine loaded and then was never deleted, causing memory fragmentation. Also removed inner tooltip call to the GuiManager runloop, which makes the logic simpler since the tooltip is a bit of a hack. I had to remove it because deleting _tooltip in the inner loop (called from tooltip itself) is trouble.
svn-id: r54311
