placed graphics.clear() in renderTile and cleaned up
placed graphics.clear() in renderTile and cleaned up

hms-dbmi/4DN_matrix-viewer,hms-dbmi/higlass,hms-dbmi/4DN_matrix-viewer,hms-dbmi/4DN_matrix-viewer,hms-dbmi/higlass,hms-dbmi/higlass,hms-dbmi/higlass