Refactor HistogrammerRunner to be ready to use a RAD histogrammer rather than HJPD
Writing with RAD Histogrammer
Swap out HJPD histogrammer for RAD histogrammer

Along the way, a few functions were refactored to better support
new histogrammers in the future. The RAD histogrammer shows
better performance than the HJPD histogrammer, but still needs
additional data (especially about standing instances) before
it will be ready for gameplay.