Make exported global application menu more menubar-y

Before

Application Menu
├── Refresh Music Collection
├── Configure Elisa
├── Configure Keyboard Shortcuts
├── Report bugs or wishes
├── Elisa handbook
├── About Elisa
└── Quit

After

File
├── Save Playlist..
├── Load Playlist...
├── Refresh Music Collection
└── Quit
View
├── Expand Player / Collapse Player
└── Enter Fullscreen / Exit Fullscreen
Controls
├── Play / Pause
├── Stop
├── Increase Volume
├── Decrease Volume
├── Shuffle
    ├── Off
    └── On
└── Repeat
    ├── Off
    └── On
Help
├── Elisa Handbook
├── About Elisa
└── Report bugs or wishes