Removed pqActiveView.

This class was lingering around since ancient times. We long replaced
this class with pqActiveObjects. Updated all code to directly use
pqActiveObjects.

Also updated MajorAPIChanges.md files to document this change.

Change-Id: I223ad816448ed4cd8f5d537af8400acd4a5cf237
BUG #15153: Update color map for the LOD mapper.

We were not setting the ColorTransferFunction on the polydata mapper
used for rendering LOD surface when volume rendering unstructured grids.
Fixed that.

Change-Id: Iccea62555ab9be58af8cbd43544521eb4636bd2c
BUG #15071: Trace changes to solid color.

Added missing tracing macros to pqEditColorMapReaction to trace changes
to solid color in pqEditColorMapReaction.

Change-Id: I541af706ec3b892f3681d61a50558bfc81347fc7
Remove "Extract Location" from the toolbar.

This filter doesn't have an icon. Don't show it in the toolbar.

Change-Id: I8e3a0d973fcff29fe67e654c12c05f35ae2da20f
Remove debugging couts.

Change-Id: I963e753ef75172e6e5eaa41e58cde43982a10d39
Merge topic '15071_trace_solid_color_changes'

1a29ff4c Remove debugging couts.
333583a3 Remove "Extract Location" from the toolbar.
732fc80c BUG #15071: Trace changes to solid color.
Merge topic '15153_fix_volume_colormap'

71054832 BUG #15153: Update color map for the LOD mapper.
Merge topic 'remove_pqActiveView'

74ff1014 Removed pqActiveView.