suggested by Grapher [here](http://forums.trovegame.com/showthread.php?3379-Troxel-a-Voxel-Viewer-and-Editor-html5-WebApp&p=18036&viewfull=1#post18036) - add tool to select color of a existing voxel (suggested by Wolfgang [here](http://forums.trovegame.com/showthread.php?3379-Troxel-a-Voxel-Viewer-and-Editor-html5-WebApp&p=18091&viewfull=1#post18091))
suggested by Grapher here