pass podId when removing/clearing presentation

...nt/src/org/bigbluebutton/main/api/ExternalApiCallbacks.as

...rg/bigbluebutton/modules/present/business/PresentProxy.as

...c/org/bigbluebutton/modules/present/events/UploadEvent.as

.../bigbluebutton/modules/present/managers/PresentManager.as

...luebutton/modules/present/services/PresentationService.as

...bluebutton/modules/present/ui/views/FileUploadWindow.mxml

...uebutton/modules/present/ui/views/PresentationWindow.mxml

...odules/present/ui/views/UploadedPresentationRenderer.mxml