ENH: Support any pixel type ElastixLibGTest `GetPixelTypeName<TPixel>()`
ENH: Support any pixel type ElastixLibGTest `GetPixelTypeName<TPixel>()`

The original `GetPixelTypeName<TPixel>()` only supported short and int, causing compile errors in `ElastixLib.TransformParametersAreZeroWhenFixedImageIsMovingImage`, when other pixel types were added (CMake flags `ELASTIX_IMAGE_2D_PIXELTYPES`, `ELASTIX_IMAGE_3D_PIXELTYPES`, and `ELASTIX_IMAGE_4D_PIXELTYPES`).

SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix,SuperElastix/elastix