Updating ParaView icons.

Updating ParaView icons to a newer version -- flat shading.

Change-Id: I4ba122f7899e9dad6fa99f5a70964133c9dc45ee
Based on popular demand, splash screens are back by default.

Change-Id: Idc19300fcb019dfa7a0a543afea4869dc9eb2bf8
Minor edits to About dialog formatting and layout.

Change-Id: I7c8471a65c0ac95a35e764de355673124f23f28a
Update the splash screen images.

Change-Id: I2a7b5503371e66295551e12729aad9796d3f86e1
Merge topic 'update_paraview_icons' into next

bb2e9213 Update the splash screen images.
7b05e8eb Minor edits to About dialog formatting and layout.
9d5f2a26 Based on popular demand, splash screens are back by default.
21e0e226 Updating ParaView icons.