PATh-762: Adding a debug flag for server testing to always show the rebake navmesh button on dirty regions regardless of whether the user has permissions.

PATH-702: Refining the behavior of the rebuild navmesh button after it is pushed, and removing unused code.

PATH-702: Tying the status of the rebake button to the status of the navmesh for the current region.

PATH-702: Positioning the rebake navmesh button to align with the Stand/StopFlying buttons.  Also, parenting the buttons to the toolbar UI elements.

Path-722: Fixed bug where navmesh rebake panel was being removed after navmesh debug window was closed. Minor code cleanup.

path-722: handling the case where region entry or teleporting would cause the rebake button to be drawn ontop of splash screen.

PATH-705: Creating a path to pull in the state of the current region navmesh without downloading the navmesh binary.

BUGFIX: Correcting a behavior where moving the cursor over a selected object inappropriately called updateControls().  Fix was to break the updateControl() functionality into two separate handlers updateControlsOnScrollListChange() and updateControlsOnInWorldSelectionChange().