* Moving ShortcutDelimiter from MenuBar to Key.
* Rename to ShortcutKey and change type to Key.
* Improving add and remove menu items dynamically.
* Code cleanup.
* Fix status bar shortcuts issues.
* Fix build error.
* Change HotKey type to Key.
* Change HotKey.setter to private.
* Fix warnings.
* Fix some bugs.
* Rename ShortcutDelimiter to Separator.
* Add Separator property into the Configuration Manager.
* Change XML doc for Separator.
* Replace KeyEvent with Key.
* Add unit test preventing the Key.Separator is never Null ('\0).
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