Move the edit menu logic to uiInit

Make context the first argument of operation objects
Add Paste operation to edit menu when opening the context menu on a blank area of the map (close #2508)

modules/operations/split.js

@@ -4,7 +4,7 @@ import { behaviorOperation } from '../behavior/operation';
 import { modeSelect } from '../modes/select';
 
 
-export function operationSplit(selectedIDs, context) {
+export function operationSplit(context, selectedIDs) {
     var vertices = selectedIDs
         .filter(function(id) { return context.graph().geometry(id) === 'vertex'; });
     var entityID = vertices[0];