Created a new behavior class, pqApplyBehavior, that encapsulates the
logic that must ensure after an apply. Moving relevant parts out of
pqPropertiesPanel to this new class.

pqApplyBehavior now also handles resetting or growing on transfer
function range on each apply.

Added mechanism to
vtkSMTransferFunctionProxy/vtkSMTransferFunctionManager to reset the
transfer function range using the ranges from all available
representations.

Added a new option in vtkPVGeneralSettings to allow user to pick
between growing transfer function range and clamping transfer function
range on each Apply.

Change-Id: I2e75953437785dfdd15a10bafc521d7a26298c11