Fix ITKv3 build within Slicer

MakeOutput(0) error in itkImageToImageRegistrationMethod.txx
Fix Cleaver build by compiling with fPIC
Merge branch 'fix-linux-build' into next

* fix-linux-build:
  Fix Cleaver build by compiling with fPIC
  Fix ITKv3 build within Slicer
Fix armature loading tree view bug

The nodes are correctly setup, it's just that the scene annotation model
is displaying the tree before the hierarchy node is added.
Merge branch 'fix-armature-loading-in-tree-view' into next

* fix-armature-loading-in-tree-view:
  Fix armature loading tree view bug
Hide SampleData module instead of ignoring it
Merge branch 'hide-sample-data-dont-ignore' into next

* hide-sample-data-dont-ignore:
  Hide SampleData module instead of ignoring it
Fix GLEW dependency for SOFA on Linux
Merge branch 'fix-linux-build' into next

* fix-linux-build:
  Fix GLEW dependency for SOFA on Linux
Automatically display mesh scalars after CreateTetrahedralMesh ran
Fix volume rendering node access in the workflow
Merge branch 'AddModelScalarSupport' into next

* AddModelScalarSupport:
  Fix volume rendering node access in the workflow
  Automatically display mesh scalars after CreateTetrahedralMesh ran
Fix icon in annotations to drop
Merge branch 'FixBoneDroping' into next

* FixBoneDroping:
  Fix icon in annotations to drop
Add Bender Welcome module

Add the bender welcome volume. Much like the SlicerWelcome module (now
removed from the lists of available modules), the BenderWelcome module
simply redirects the user. In this case, it's to either workflow (simpe
or FEM) or the bender sample data module.
Merge remote-tracking branch 'githubOrigin/WelcomeModule' into next

* githubOrigin/WelcomeModule:
  Add Bender Welcome module
Add PadImage filter
Add padding in CreateTetrahedralMesh as optional
Add PadImage filter into FEM workflow
Restore vtkMRMLDisplayableNode::GetNthDisplayNodeByClass

Used by the volume rendering section in the workflow module.