New menu utilities, simplified and generalized menu API

[CosimoTiger]

• merge the InventoryListener interface into IMenu to lessen the nonsense of unused extracted interfaces
• drop menu properties in favor of simplicity, use ActionMenu instead with MenuActions
• add a neat ActionMenu.ActionMenuIterator
• separate common menu logic into MenuUtils as publicly available methods and constants
• introduce the concept of columns and rows as a utility in MenuUtils and IMenu itself
• drop the Range annotation nonsense
• write unit tests for some menu methods and utilities
• improved documentation
• reduce menu setters to setting an item, action or both to one or multiple slots with support for most collections