Merge pull request #6010 from Tainan404/zoom-implementation

bigbluebutton-html5/client/main.html

bigbluebutton-html5/imports/api/slides/server/methods.js

...tton-html5/imports/api/slides/server/methods/zoomSlide.js

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

...omponents/presentation/presentation-overlay/component.jsx

...omponents/presentation/presentation-overlay/container.jsx

...omponents/presentation/presentation-toolbar/component.jsx

...omponents/presentation/presentation-toolbar/container.jsx

...i/components/presentation/presentation-toolbar/service.js

.../components/presentation/presentation-toolbar/styles.scss

...presentation/presentation-toolbar/zoom-tool/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/imports/utils/slideCalcUtils.js

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

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

bigbluebutton-html5/private/locales/en.json

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

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