Minor requests - Interface

[TheInvoker]

These are minor requests just for better interface and usage
- New button to enqueue files
- New button to switch to queue and close Avidemux
- Don't resize window when loading/closing a file
- Adapt video to window dimensions (zoom to fit)
- Show total frames in file info

[eumagga0x2a]

- Adapt video to window dimensions (zoom to fit)

Manually (press 0) and automatically when maximized: available since ages.

- Show total frames in file info

Frames or pictures? The former is trivially possible but presumably useless, the latter would require to decode the entire stream to display a meaningful result.

[TheInvoker]

- Adapt video to window dimensions (zoom to fit)

Manually (press 0) and automatically when maximized: available since ages.

- Show total frames in file info

Frames or pictures? The former is trivially possible but presumably useless, the latter would require to decode the entire stream to display a meaningful result.

Manually. i meant auto adapt when loading, maybe it wasn't clear.
Frames. Not so important but sometimes it's useful