Cleanup: renaming "frame" to "character"

The "frame" variable actually contains a string pointing to the character selected.
It has nothing to do with a frame which is usually a particular image in an animation.

I'm renaming the variable accross the application to avoid confusion.

back/src/Model/Websocket/ExtRoom.ts

@@ -25,7 +25,7 @@ let RefreshUserPositionFunction = function(rooms : ExtRooms, Io: socketIO.Server
             roomId: socket.roomId,
             position: socket.position,
             name: socket.name,
-            frame: socket.frame,
+            character: socket.character,
         };
         let dataArray = <any>[];
         if (mapPositionUserByRoom.get(data.roomId)) {
@@ -41,4 +41,4 @@ let RefreshUserPositionFunction = function(rooms : ExtRooms, Io: socketIO.Server
 
 export {
     RefreshUserPositionFunction
-}
+}