Add hand icon

...ui/components/whiteboard/whiteboard-overlay/component.jsx

...d/whiteboard-overlay/pan-zoom-draw-listener/component.jsx

...ui/components/whiteboard/whiteboard-toolbar/component.jsx

...iteboard/whiteboard-toolbar/toolbar-submenu/component.jsx

bigbluebutton-html5/private/config/settings-development.json

bigbluebutton-html5/private/locales/en.json

.../public/resources/images/whiteboard-cursor/pan-closed.png

.../public/resources/images/whiteboard-cursor/pan-closed.svg

...n-html5/public/resources/images/whiteboard-cursor/pan.png

...n-html5/public/resources/images/whiteboard-cursor/pan.svg