Updated LocalHistogramEqualization to support Color

It doesn't compile right now
Added mask support to ColorHistogram
Added support for grabbing neighborhoods from color images
fixed a bug in LocalHistogramEqualization.cs
Simplified the code a bit in LocalHistogramEqualization
Fixed PowerLaw to support color
LogTransformation now supports color images
Updated BasicSpatialSubFilter.cs to support color images
AlphaTrimmedMeanFilter now supports color images
Fixed ArithmeticMeanFilter to support color images
Updated ContraharmonicMeanFilter to support color images
BitplaneManipulator now supports color images
GeometricMeanFilter now supports color images
Modified HarmonicMeanFilter to support color images
HighBoostfilter now supports color images
Max filter now supports color images
MedianFilter now supports color
MidpointFilter supports color images
MinFilter now supports color images
Changed the FromArgb calls in several classes to the three arg version