Remove obsolete pqPickHelper class.

The class doesn't seem to be compiled since a while (I believe it was replaced
by pqRubberBandHelper).

Change-Id: Ib533b7aa15c521e1ad886151deb0e210a2af7dd5
Removing obsolete pqSelectThroughPanel.

pqSelectThroughPanel wasn't used anywhere anymore. Removing it.

Change-Id: I33851b1c3787c0e01177037b4b257e06ae67debd
BUG #14046: Fixing issues with interaction modes and multiple views.

The use pqRubberBandHelper between multiple views was causing weird interaction
issues with selection modes, picking and such. Refactored the code to deprecate
pqRubberBandHelper. Instead, we now use pqRenderViewSelectionReaction to assist
with selection modes for the render views. Cleaned up usage of
pqRubberBandHelper to use the new refactored code.

Leaving pqRubberBandHelper for backwards compatibility. It should be removed in
future versions.
Merge topic '14046_fix_selection_issues' into next

e67c548 BUG #14046: Fixing issues with interaction modes and multiple views.
e8c4bb8 Removing obsolete pqSelectThroughPanel.
173d529 Remove obsolete pqPickHelper class.