Add sensitivity slider for mouse emulation with controller

[mevouc]

Added

1. A new setting "Mouse emulation sensitivity" under "Mouse emulation via gamepad" and "Use an analog stick to scroll"
   • Greyed out when "Mouse emulation via gamepad" is un-checked
   • Open a slider to select user preferred mouse sensitivity using emulation with gamepad. Goes from 20 to 400 (default 100, step 10)
2. Localization
   • English
   • French

Screenshots

Settings when "Mouse emulation via gamepad" is checked:

Settings when "Mouse emulation via gamepad" is un-checked:

Slider + default value:

Slider + minimal value:

Slider + max value:

Menu view with a phone + French:

Slider view with a phone + French:

Not impacted but related

Pressing X

There was an existing feature to "control" the speed of the cursor when using mouse emulation, by pressing button X.

This feature remains untouched, because it's very buggy and not reliable:

• you can't go in straight lines: when pressing X, you're forced to go in diagonal
• you can increase the speed by pressing Y, but there's no UI feedback about it and it can go crazy (255 steps).

I'm considering removing this other speed feature in a separate PR, because it's 1. buggy, and 2. very badly written (hardcoded values, no zero value handling).

Scrolling speed

I did not add a slider for the scrolling speed (when using the other analog stick of the gamepad), just because I find it fine and less anoying than the cursor speed. But it's up to suggestion for consistency.

Related to #452

[ClassicOldSong]

Thank you very much for the PR, but the locale part I prefer only adding English and parts you're sure about. Translations should use a separate pass since lots of other languages are already missing loads of translations.

[mevouc]

Alright, I understand I was unsure about that part anyway. Thanks for the feedback.

I've added a commit to remove all languages except English and French.

[mevouc]

Hi @ClassicOldSong. Were you able to take a new look at this?

[ClassicOldSong]

Definitely, being busy recently, will take a look soon!

[mevouc]

No problem. I don't want to spam you