Some more refactoring and update ScreenSpaceCameraController to handle input in Columbus view.
Some more refactoring and update ScreenSpaceCameraController to handle input in Columbus view.

CesiumGS/cesium,soceur/cesium,kiselev-dv/cesium,aelatgt/cesium,NaderCHASER/cesium,YonatanKra/cesium,denverpierce/cesium,likangning93/cesium,YonatanKra/cesium,oterral/cesium,NaderCHASER/cesium,emackey/cesium,AnimatedRNG/cesium,geoscan/cesium,kiselev-dv/cesium,wallw-bits/cesium,hodbauer/cesium,aelatgt/cesium,josh-bernstein/cesium,CesiumGS/cesium,omh1280/cesium,wallw-bits/cesium,soceur/cesium,kiselev-dv/cesium,hodbauer/cesium,jason-crow/cesium,omh1280/cesium,progsung/cesium,esraerik/cesium,geoscan/cesium,denverpierce/cesium,omh1280/cesium,CesiumGS/cesium,ggetz/cesium,kaktus40/cesium,wallw-bits/cesium,AnimatedRNG/cesium,likangning93/cesium,CesiumGS/cesium,likangning93/cesium,jasonbeverage/cesium,likangning93/cesium,esraerik/cesium,jasonbeverage/cesium,YonatanKra/cesium,NaderCHASER/cesium,soceur/cesium,emackey/cesium,AnalyticalGraphicsInc/cesium,josh-bernstein/cesium,CesiumGS/cesium,ggetz/cesium,esraerik/cesium,denverpierce/cesium,oterral/cesium,AnimatedRNG/cesium,hodbauer/cesium,likangning93/cesium,ggetz/cesium,kaktus40/cesium,aelatgt/cesium,denverpierce/cesium,wallw-bits/cesium,jason-crow/cesium,aelatgt/cesium,omh1280/cesium,ggetz/cesium,progsung/cesium,jason-crow/cesium,jason-crow/cesium,AnalyticalGraphicsInc/cesium,oterral/cesium,kiselev-dv/cesium,AnimatedRNG/cesium,emackey/cesium,YonatanKra/cesium,emackey/cesium,esraerik/cesium