There must be no menubar on Linux and Windows.

[pouyakary]

Orchestra's Menu bar must be only visible on the macOS. On Windows and Linux the menubar will be augmented to the title less window and destroyed the whole UI.

Therefore these steps are needed:

• Disabling menubar on Windows and Linux
• Adding a Keyboard-Event Manager to handle the shortcuts without using menubar.
• Adding all the missing buttons of the menubar to the UI5's ribbon.