ntk menu command implemented as ::itcl::extendedclass ::ntk::classes::menu

Syntax:

     :   '''ntk menu''' ''windowPathName'' ?''options''?

Options:

MethodVariables:
    * '''itemTypes''': the types of the items. Possible values: entry menu separator. (default: {})
    * '''itemCallbacks''': the callback for entry types (default: {})
    * '''items''': the parts of the menu (default: {})

Public commands:

    * '''addentry''' ''text callback''
    * '''addmenu''' ''text''
    * '''addseparator'''

Inheritance:

    * theme

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