Use Space key to... "6 in 1" option

[Dreamer]

Use Space key to:

- Start/Stop Quick Slide Show with transition effects (leave Pause key option as is - without t.e.)
- Start/Stop Quick Slide Show without transition effects
- Start/Stop Random Quick Slide Show with transition effects
- Start/Stop Random Quick Slide Show without transition effects
- Switch to the Next file
- Switch to the Random file

(Most of these requests have been already requested)

I think this option would be useful also in context menu, user could set Space key to option he currently needs.

I suggest also one alternative, stable shortcut/hotkey for all options above:

- Start/Stop Quick Slide Show with transition effects - T
- Start/Stop Random Quick Slide Show with transition effects - R ?
- Start/Stop Random Quick Slide Show without transition effects - ?
- Switch to the Random file - ?

- Start/Stop Quick Slide Show without transition effects - Pause - already exists
- Switch to the next file - PageDown - already exists