Compile on Xcode Version 8.2.1 (8C1002), swift-3

[Norod]

Compile on Xcode Version 8.2.1 (8C1002), swift-3

• Updated input arguments of vImageHistogramCalculation_ARGB8888 for Swift3
• Adjusted input arguments of vImageHistogramSpecification_ARGB8888 for Swift3
• Clicked a lot of "Fix it" hiding behind little red circles with a white dot in them 😒
• Performed short sanity to make sure calls to vImageHistogramXXX are okay
• Made sure it also compiles with non-simulator targets
• Made sure it also runs the custom-Metal shaders

Known issue: Custom Metal filter only show the output if they are selected before any other filter