ENH: Update SimpleITK to v1.2.0 release

Sam Horvath requested to merge github/fork/jamesobutler/update-simpleitk into master

Created by: jamesobutler

Release Notes: https://github.com/SimpleITK/SimpleITK/releases/tag/v1.2.0

Built and ran tests with the following results that don't seem related. It was a Windows7-VS2015-64bits-QT5.10.1 configuration. Could be good to include in Slicer 4.10.1 release.

99% tests passed, 3 tests failed out of 664 . . . 1>The following tests FAILED: 1> 6 - cmake_slicer_generate_extension_description_test (Failed) 1> 512 - MergeModelsTestCompare (Failed) 1> 663 - py_LandmarkRegistration (Failed)

Merge request reports