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Fixes #19033. The box widget needed to faithfully follow the state of
UseReferenceBounds even when the ReferenceBounds were overridden. By
keeping PlaceWidget bounds and ReferenceBounds separate, we can support
this use-case.

Also added a test for this use-case.

Some are user-facing and some aren't user-facing. Found via `codespell -q 3 -D ~/Documents/diff-experiment/dictionary.txt --skip="./ThirdParty,./Qt" -I ../paraview-whitelist.txt`
whitelist contents were
```
ans
behaviour
cas
dum
initialise
initialisation
lod
nd
ot
pres
wont
```

This run of `clang-tidy` removes unnecessary `virtual` keywords and adds
`override` where necessary.

Fix many warnings about overriden member functions not being marked
'override'.

This commit was generated automatically by running:

Utilities/Scripts/clang-format.bash --tracked

This was done automatically by running the script that was used already to
convert the documentation to doxygen style during the documentation
generation.

Commands:
/usr/bin/perl  $PWD/VTK/Utilities/Doxygen/doc_header2doxygen.pl  --to /tmp/tmpheaders --relativeto  $PWD/.  $PWD/Catalyst/Editions/Base/CoProcessing/Catalyst $PWD/Catalyst/Editions/Essentials/ParaViewCore/VTKExtensions/Default $PWD/Catalyst/Editions/Essentials/VTK/Filters/Extraction $PWD/Catalyst/Editions/Essentials/VTK/Filters/General $PWD/Catalyst/Editions/Extras/ParaViewCore/VTKExtensions/Rendering $PWD/Catalyst/Editions/Extras/VTK/Filters/Sources $PWD/Catalyst/Editions/Extras/VTK/IO/Legacy $PWD/Catalyst/Editions/Extras/VTK/IO/Parallel $PWD/Catalyst/Editions/Extras/VTK/IO/XML $PWD/Catalyst/Editions/Rendering-Base/ParaViewCore/ClientServerCore/Rendering $PWD/Catalyst/Editions/Rendering-Base/ParaViewCore/ServerManager/Default $PWD/Catalyst/Editions/Rendering-Base/VTK/Filters/Parallel $PWD/Catalyst/Editions/Rendering-Base/VTK/IO/Image $PWD/Catalyst/Editions/Rendering-Base/VTK/Interaction/Widgets $PWD/CoProcessing/Catalyst $PWD/CoProcessing/PythonCatalyst $PWD/CoProcessing/TestDriver $PWD/ParaViewCore/Animation $PWD/ParaViewCore/ClientServerCore/Core $PWD/ParaViewCore/ClientServerCore/Default $PWD/ParaViewCore/ClientServerCore/Rendering $PWD/ParaViewCore/ClientServerStream $PWD/ParaViewCore/Common $PWD/ParaViewCore/ServerImplementation/Core $PWD/ParaViewCore/ServerImplementation/Rendering $PWD/ParaViewCore/ServerManager/Core $PWD/ParaViewCore/ServerManager/Default $PWD/ParaViewCore/ServerManager/Rendering $PWD/ParaViewCore/ServerManager/SMApplication $PWD/ParaViewCore/VTKExtensions/CGNSReader $PWD/ParaViewCore/VTKExtensions/Core $PWD/ParaViewCore/VTKExtensions/CosmoTools $PWD/ParaViewCore/VTKExtensions/Default $PWD/ParaViewCore/VTKExtensions/Points $PWD/ParaViewCore/VTKExtensions/Rendering $PWD/Qt/ApplicationComponents $PWD/Qt/Components $PWD/Qt/Core $PWD/Qt/Deprecated $PWD/Qt/Python $PWD/Qt/Widgets $PWD/Web/Core $PWD/Web/Python $PWD/Web
\cp -rf /tmp/tmpheaders/* $PWD

Removed using the following command:

    perl -0777 -i -pe 's/(\n* *\/\/ *[BE]TX *\n+)+/\n\n/g'

on all vtk*.h, pq*.h and finished off by a few manual removals left over
from that.

These are reserved symbols.

Fixing export macros (and other header testingn failures).

Change-Id: Ib92aed44cd105f66abad99b88edccddb34ae9859

Fix conflicts with collaboration branch.

* Created new ParaViewCore directory in place of Servers.
* Moved classes from old directories to new ones.
* Removed some obsolete classes that were lingering in Filters/ServerManager.

The CVS $Revision$ keyword replacement will no longer maintain these
macros automatically.  They were used only to implement CollectRevisions
and vtkObjectBase::PrintRevisions, an API that was never used.

Automated as follows:

  pass 0:
  catch templates
  ---------------
  $ git grep 'vtk\(Cxx\|Type\)RevisionMacro' | grep '<'

  pass 1:
  main changes
  ---------------
  $ git grep -l '^vtkCxxRevisionMacro' | while read file; do
    echo "$file" 1>&2
    perl -i -ne 'print unless (/^vtkCxxRevisionMacro/ and /\)/)' $file
  done
  $ git grep -l -e 'vtkTypeRevisionMacro(' | while read file; do
    echo "$file" 1>&2
    perl -i -pe 's/vtkTypeRevisionMacro/vtkTypeMacro/g' $file
  done

  pass 2:
  verify
  ---------------
  $ git grep 'vtk\(Cxx\|Type\)RevisionMacro'

Fixed multi-line vtkCxxRevisionMacro and templates by hand.

The CVS $Revision$ keyword replacement will no longer maintain these
macros automatically.  They were used only to implement CollectRevisions
and vtkObjectBase::PrintRevisions, an API that was never used.

Automated as follows:

  pass 0:
  catch templates
  ---------------
  $ git grep 'vtk\(Cxx\|Type\)RevisionMacro' | grep '<'

  pass 1:
  main changes
  ---------------
  $ git grep -l '^vtkCxxRevisionMacro' | while read file; do
    echo "$file" 1>&2
    perl -i -ne 'print unless (/^vtkCxxRevisionMacro/ and /\)/)' $file
  done
  $ git grep -l -e 'vtkTypeRevisionMacro(' | while read file; do
    echo "$file" 1>&2
    perl -i -pe 's/vtkTypeRevisionMacro/vtkTypeMacro/g' $file
  done

  pass 2:
  verify
  ---------------
  $ git grep 'vtk\(Cxx\|Type\)RevisionMacro'

Fixed multi-line vtkCxxRevisionMacro and templates by hand.

subclasss needed to override that as well to ensure that changes are pushed
correctly.