whiteboard performance improvements

...n/scala/org/bigbluebutton/core/apps/WhiteboardModel.scala

...on-html5/imports/ui/components/presentation/component.jsx

...n-html5/imports/ui/components/subscriptions/component.jsx

...teboard/annotation-factory/reactive-annotation/service.js

...hiteboard/annotation-factory/static-annotation/service.js

...s/ui/components/whiteboard/annotation-group/container.jsx

...orts/ui/components/whiteboard/annotation-group/service.js

...i/components/whiteboard/annotations/ellipse/component.jsx

...5/imports/ui/components/whiteboard/annotations/helpers.js

...s/ui/components/whiteboard/annotations/line/component.jsx

...ui/components/whiteboard/annotations/pencil/component.jsx

...components/whiteboard/annotations/rectangle/component.jsx

...s/ui/components/whiteboard/annotations/text/component.jsx

.../components/whiteboard/annotations/triangle/component.jsx

...ebutton-html5/imports/ui/components/whiteboard/service.js

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

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

...ard/whiteboard-overlay/pencil-draw-listener/component.jsx

...ts/ui/components/whiteboard/whiteboard-overlay/service.js

...oard/whiteboard-overlay/shape-draw-listener/component.jsx