Proof of concept: Control game speed with right thumbstick

[DanEEStar]

What does this PR do

By steering the xAxis of the right thumbstick the player can control
the game speed of the emulator directly.
Press "right" -> GameSpeed.fast
Press "left" -> GameSpeed.slow
Neutral position -> GameSpeed.normal

This is basically just a proof of concept. But maybe someone has the same problems as I had...

Where should the reviewer start

I don't know if this makes sense to merge...

How should this be manually tested

Any background context you want to provide

I recently started playing some older JRPGs in Provenance like Dragon Quest 1 and Final Fantasy VI. The battles especially in the beginning, can become very boring. You basically just have to press "Attack" and wait...
Also manually changing the Game Speed via the menu became boring fast...

So my idea was to map the Game Speed control to some, often unused, buttons on my XBOX-Gamepad. So I mapped the GameSpeed to the right thumbstick.

With this small change I can control the Game Speed in game directly with the controller.

What are the relevant tickets

Screenshots (important for UI changes)

Questions

[jasarien]

Interesting idea. Not sure it should be merged in its current form though, as it might interfere with cores that use the right stick in their controller layer (PSX and n64 come to mind, initially...).

Maybe it could be morphed into a setting-controlled feature that can be turned off and on in the settings, and maybe further do it on a core by core basis?

[jasarien]

As per my previous comment.

[urherenow]

First, I'd like to say that this is sorely needed. Just from playing Metroid, and I've played it hundreds of times, I can say with 100% certainty that NES emulation is actually too fast on my iPAD and on my iPhone. Sure it may be a core issue, but this feature would certainly allow for correction.

In line with the settings suggestion above, I would like to add that it should be controlled with a slider, default emulation speed being center.