* About land
 * Appearance
 * Gestures
 * Inventory
 * Map
 * Nearby voice
 * Snapshot

removed hover highlighting of buttons when dragging over them
also updated toolbar button art to match spec

EXP-1286 : Clean-up the mess I added to llcommandmanager. All CommandId now have a trusted UUID which is the base for indexing and comparison.

EXP-1280 FIX -- Minimized floaters associated with toolbar buttons should change the state of their parent button

* Toolbar buttons now display green when its corresponding floater is open or
  minimized.
* Made changes to buttons so flash time and rate is configurable
* Removed unused "highlight_color" attribute from LLButton
* Implemented "isVisible" function for toolbar button floaters.  It returns true
  when the floater is visible or minimized.
* Toolbar floater unminimize now also puts focus to the floater
* All commands now specify their "is_running_function" for toolbar button state
* ButtonFlashCount and ButtonFlashRate have been moved to button.xml settings
  and are now configurable on the button.  Toolbar buttons are set to never
  flash and this functionality is used to show which buttons have windows open.
* All toybox buttons show hover glow even when disabled

Reviewed by Richard.

EXP-1286 : DaD works between all toolbars, button drops in correct place, removal of button works too

EXP-1294 Nearby chat floater doesn't accommodate existing chat history when expanded

  currently not hooked to any functionality.

another attempt at fixing gcc builds