Merge pull request #3459 from oswaldoacauan/refactor-api-presentation-slides

...button-html5/imports/api/chat/server/modifiers/addChat.js

...l5/imports/api/meetings/server/modifiers/clearMeetings.js

...l5/imports/api/meetings/server/modifiers/removeMeeting.js

...n-html5/imports/api/presentations/server/eventHandlers.js

...s/api/presentations/server/handlers/presentationChange.js

...pi/presentations/server/handlers/presentationInfoReply.js

...s/api/presentations/server/handlers/presentationRemove.js

...luebutton-html5/imports/api/presentations/server/index.js

...ebutton-html5/imports/api/presentations/server/methods.js

...ts/api/presentations/server/methods/switchSlideMessage.js

...rts/api/presentations/server/modifiers/addPresentation.js

...entations/server/modifiers/addPresentationToCollection.js

...esentations/server/modifiers/changeCurrentPresentation.js

.../api/presentations/server/modifiers/clearPresentations.js

...ntations/server/modifiers/clearPresentationsCollection.js

...ports/api/presentations/server/modifiers/eventHandlers.js

.../api/presentations/server/modifiers/removePresentation.js

...ions/server/modifiers/removePresentationFromCollection.js

...on-html5/imports/api/presentations/server/publications.js

...tton-html5/imports/api/presentations/server/publishers.js