Enhancements
- Add GitHub Actions configuration for OpenCL PyPI upload ([ab995fe](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/ab995fe))
- Add OpenCL wheel build support to GitHub Actions CI ([72fe48b](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/72fe48b))
- Add --output-on-failure flag to GitHub Actions ctest ([81505f5](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/81505f5))
- Also build / run elastix tests ([db8b576](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/db8b576))
- Add Build, test, package, GitHub Action ([d4ff994](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/d4ff994))
- Bump Python package version to 0.6.0 ([95053e7](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/95053e7))
- Update OpenCL Linux Python package scripts for ITK 5.1.0 ([43506ed](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/43506ed))
- CI builds against ITK 5.1.0 ([61c83f4](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/61c83f4))
- Update CI Virtual Machine images ([46d0c3a](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/46d0c3a))
- CI builds against ITK 5.1 RC 3 ([4bd5b2a](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/4bd5b2a))
- CI builds against ITK 5.1 RC 2 ([4b29f86](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/4b29f86))
- Make TransformParameterObject an indexed output ([fb42536](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/fb42536))
Documentation Updates
- Update Copyright assignment to NumFOCUS ([e34ca88](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/e34ca88))
- Add Masks notebook ([043a7f0](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/043a7f0))
- Add notebook links to the README ([34616b2](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/34616b2))
- Link to elastix manual and elastix parameter file database ([8987e97](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/8987e97))
- Use compare widget in notebooks ([c3520b7](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/c3520b7))
- Notebook content for serializing ParameterObject's ([b44ffc0](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/b44ffc0))
- Require itkwidgets>=0.25.1 ([af693a2](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/af693a2))
- Require itk-elastix>=0.5.1 on Binder ([0e5a954](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/0e5a954))
- Add registration parameters notebook ([712b379](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/712b379))
Platform Fixes
- Suppress itkHexahedronCell aggressive loop optimization warnings ([2fd3533](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/2fd3533))
- Do net run setup.py cleanup on Windows builds ([92ae6f4](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/92ae6f4))
- GetOutput return type const-ness ([b38d8db](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/b38d8db))
- Address OpenCL TimeStampFormat ITK 5.1 typed enum compile error ([facd9b5](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/facd9b5))
- Elastix build error with GCC 4.8 ([d0b6c25](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/d0b6c25))
- Update elastix commit for ITK 5.1.0 ([c31d82d](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/c31d82d))
- Update elastix commit for ITK 5.1 RC 3 ([1e1daec](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/1e1daec))
Bug Fixes
- Remove Azure Pipelines configuration ([aafa365](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/aafa365))
- Only include module tests on Windows CI ([420b67a](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/420b67a))
- Reduce Windows Python package build path ([438bcd0](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/438bcd0))
- Exclude elastix_run* tests from elastix in CI ([51dedcc](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/51dedcc))
- Reduce external project path for Windows Python builds ([4df5028](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/4df5028))
- Set ELASTIX_BUILD_EXECUTABLE non-cache variable ([88510af](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/88510af))
- Set default parameter for FixedInternalImagePixelType ([b2d6d8b](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/b2d6d8b))
- Call elx ([18d0680](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/18d0680))
- Define GetOutput() for Python wrapping ([fd5530b](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/fd5530b))
- Fix .GetClassName() for ParameterObject ([56c65e7](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/56c65e7))
- Update Python test for indexed transform output ([4ecc909](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/4ecc909))
- Require ipympl-0.4.1 in MyBinder build ([944aa40](https://github.com/InsightSoftwareConsortium/itkwidgets/commit/944aa40))