Create Window menu and add maximize and minimize actions in CUBRID Tools for Mac

In current version of CUBRID Tools, there is no Window menu and no menu actions to maximize or minimize the window. Users need to manually click by a mouse pointed on - and + buttons on the left corner of the window.

It is pretty much standard on Mac OS X that most GUI based applications have Minimize and Zoom/Zoom Window menu items in Window menu item which allow developers to assign a keyboard shortcut system wide to those menu items to make it more convenient and fast to toggle between maximized and normal window.

Please create a Window menu item and add two actions to Window menu. It's very simple:

1. Minimize with a Cmd+M shotcut
2. Zoom Window (usually this menu has no shortcut, sometimes users assign Shift+Cmd+M to this menu)

Similar action can be added to Windows and Linux versions as well to provide more convenience to CUBRID Tools users.