[bugfix] Stop update while showing dialog boxes. Fixes #629 #631
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This fixes the problem that rviz becomes effectively unusable when the update/render cycle takes too long (e.g. while showing high-frequency point cloud data).
All the dialogs will keep the main thread from calling any ROS callbacks, update functions or re-rendering the 3d view while they are active.
Also, removes outdated stuff from visualization manager.