WIP remove callback from mongo operations

...html5/imports/api/cursor/server/modifiers/updateCursor.js

...api/group-chat-msg/server/modifiers/removeGroupChatMsg.js

...mports/api/group-chat-msg/server/modifiers/startTyping.js

...mports/api/group-chat/server/handlers/groupChatCreated.js

...orts/api/group-chat/server/handlers/groupChatDestroyed.js

...tml5/imports/api/group-chat/server/handlers/groupChats.js

...5/imports/api/group-chat/server/modifiers/addGroupChat.js

...mports/api/group-chat/server/modifiers/removeGroupChat.js

...ocal-settings/server/modifiers/setChangedLocalSettings.js

...imports/api/meetings/server/handlers/meetingLockChange.js

...rts/api/meetings/server/handlers/recordingStatusChange.js

...orts/api/meetings/server/handlers/recordingTimerChange.js

...l5/imports/api/meetings/server/handlers/userLockChange.js

...ports/api/meetings/server/handlers/webcamOnlyModerator.js

...ports/api/meetings/server/modifiers/changeLockSettings.js

...5/imports/api/meetings/server/modifiers/changeUserLock.js

...orts/api/meetings/server/modifiers/webcamOnlyModerator.js

...button-html5/imports/api/note/server/modifiers/addNote.js

...utton-html5/imports/api/polls/server/modifiers/addPoll.js

...on-html5/imports/api/polls/server/modifiers/removePoll.js