feat: add speed gesture when fullscreen

[2gr]

Hey, I implemented playback speed controls when in fullscreen (with some help from Claude) (ref. issue: InfinityLoop1308/PipePipe#825)

• When enabled, swiping up or down in the middle of the screen controls the playback speed
• To avoid issues w/ swiping to enter/exit fullscreen, the "Swipe to control playback speed" disables the "Fullscreen gesture control" option and vice-versa
• When "Fullscreen gesture control" was off, there was a flicker when swiping on non-fullscreen video. The change on BasePlayerGestureListener.kt ensures that the flicker won't happen.
• I arbitrarily set a min speed of 0.1 and a max of 4

If you require any changes at all let me know :)

EDIT: Forgot to include, but I did test the change on my own device

[InfinityLoop1308]

Thanks for working on this. The flicker in the non-fullscreen player is a separate known issue and does not need to be fixed in this PR, so I added a follow-up commit reverting the change to BasePlayerGestureListener.kt. I also updated the setting wording and added the corresponding localized strings.

[klaviartur]

Hey, I was planning on reimplementing this in PipePipe as I did in tubular, but I ran into IDE Problems and couldn't even start looking into the details yet. I'm glad and thankful, you did it and we all can use it pretty soon.
Still, whenever I find the time to sort out the infrastructure problems, I would like to give it a go and put this into a larger gesture concept that will allow for both controlling full screen and tempo with gestures.