Exodus Inspector: Add 'all on' and 'all off' pushbuttons

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

The Exodus Reader UI in ParaView has 'All On' and 'All Off' buttons in the sections for Element Variables, Node Variables, Side Sets, Node Sets, and Display Type. Thes should be emulated in the Exodus Inspector. In addition, we should have the capability to select (windows-style) groups of 'things' in these widgets to turn on or off (with the same buttons)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information