remove deprecated catalyst export GUI and update related code paths and regression tests
Now that the Export Inspector and Export Script controls are established, we need to remove the Catalyst->Generate Script and Data Extract Writers. Besides the GUI we should also remove the internal code paths that are not shared with the new UI. Likewise we should remove the original Temporal Script Generator plugin code. While doing so, we need to update the existing regression tests so that they rely solely on the new code. We also need to make sure the users guide and paraview tutorial reflect only the new UI.
While removing old code, we want to pay attention to backwards compatibility. As much as possible, the new code should be able to run catalyst scripts generated from older ParaView versions.