Merge topic '14888_fix_state_loading_for_domains'

48d829b7 BUG #14889. Fixed pqDisplayColorWidget for values not in domain.
cf306d20 BUG #14888: Fix state loading errors.
Merge topic 'pvweb-visualizer-widgets'

0b7e449c move vtk forward
6c775593 New Web Visualizer
31af3a2c Added new proxy management protocol.
Merge master into next

Change-Id: I79387ad491f5a0df44e6c7038c74739351dc553b