Remove Intensity from Light and fix fallout. Includes fixing all xml files.
Make settings configurable
Add a limit to the number of pitches which are ultimately used to build the light (will hopefully allow the colours to be less muddy from background ambience)
Move writing of summary data to separate class.  Now also runs on background thread with a queue
Add IColourBuilder interface (ready for new Normal-distribution inspired colour builder)
Add new Colour builder, which uses the CDF of the Normal Distribution (instead of a triangle) to choose the amplitude of the various colours.  Stable, but accuracy still needs tweaking