As a user I want an editor mode

[knoffi]

• user can choose city economies separately
• user can choose the set of cities
• user can choose city graph
• user can choose position of city buttons
• make chosen parameters to json-file
• export from editor mode is a json that can be imported again with correct positions, names, and values
• name is shown on city button in editor mode

[mkraenz]

Feature	Possible implementation
Add city	add-button or click on background
delete city	delete button or drag-and-drop delete-area
connect two cities	click first city to select, then click second city (also consider deselect first city by clicking it again)
disconnect two cities	same as connect two cities
set city infos (name, stock, production)	double-click on city opens form; side-toolbar
drag city	draggable + paths follow
set player stock	click on button opens form for global settings
set player start city	same as set player stock

[mkraenz]

        const input2 = document.createElement("input");
        input2.setAttribute("type", "text");
        this.add.dom(100, 30, input2);

and follow what's described in the tooltip of this.add.dom