Window shading control apparatus for adjustment of window shades; computerized window shading control apparatus for electronic adjustment of window shades; window shading control apparatus for adjustment of window shades based on monitoring and analysis of sky conditions; window shading control apparatus for adjustment of window shades for controlling light, heat gain, heat loss, brightness, glare, solar penetration, daylighting and solar gain; window shading control apparatus for two way communication with building subsystems, building management systems, lighting control systems, and daylighting control systems