Backing out changeset fe6c8e0a4a23 (which was made to fix STORM-263).

We'll examine and fix the faulty changes.

Updated default RenderUseFBO setting to "TRUE" in settings.xml.

Added RenderUseFBO to list of parameters to be restored upon preference dialog cancel.

Updated some legacy files to correspond to default settings.

SH-287 FIXED Anti-aliasing setting does not take effect until relog

Added logic to control RenderUseFBO setting based on graphics quality.  RenderUseFBO controls whether anti-aliasing is enabled.

I'm not sure what the root cause of the problem was (maybe invalid initial selection in folder view),
but what seems to be definitely wrong is passing "scroll to rect" event
from *invisible* folder views up to accordion control, which is what I've fixed.

- Added signal to LLFloater that is emitted on minimize.

- Set minimize callback for appearance tab floater in LLSideTrayTab::undock. Method from LLSidePanelAppearance that handles camera issues
is called on minimization of floater.

When floater media browser is minimized its button bars are shrunk to zero height and their height is not restored upon unminimizing because they have auto_resize disabled. Setting min_height for the button bars makes them restored with this height upon uminimizing the floater.