Refactor #4365: Improve layers constructors
Refactor #4365: Refactor SpriteBatchNode constructor with init functionality
Refactor #4365: Refactor Menu and MenuItems constructor with init functionality
Merge branch '4365ctor' into develop-3.0
Merge pull request #1688 from pandamicro/develop-3.0

Refactor #4365: Refactor SpriteBatchNode, Menu, MenuItem constructor with init function