Extracted test for initializeStandardPlane
Extracted test conditions for custom spacing
Transformed MapperTest2D to be a recurring Test function
Extracted SetExtendInMM Test
Extracted TestRotate, might be possible to split this one further
Extractetd simple Test for Cloning
Extracted Plane comparison methods (equality, parrelel etc)
Extracted TEst for Axial Initialization
Extracted a test for Frontal Plane Initialization
Extracted Test for Saggital Plane Initialization
Removed old code, cleaned up
Created a setup-Method that initializes common variables for all Methods
Final Cleanup
Merge branch 'bug-18017-RestructurePlaneGeometryTest'