Add keyboard and mouse shortcuts

[Romanito]

It would be great to have shortcuts for the most common actions.
Using standard video players shortcuts such as:

Keyboard

• Space: pause/unpause
• Backspace: go back
• Left: skip backwards
• Right: skip forward
• F: toggle fullscreen

Mouse

• Left click anywhere on the screen: pause/unpause
• Double left click anywhere on the screen: toggle fullscreen
• Right click: context menu for advanced features

Thanks.