Android: add two QoL settings to IR pointer

[lynxnb]

This PR adds the following settings:

• IR Mode: IR pointer can now follow the user's finger or be dragged around (see commit description for more info)
• IR Always recenter: recenter IR after every pointer interaction

These settings come from the MMJ fork, and were cleaned up and ported to the MMJR fork by me. Some users are still using those forks only because of these settings, so I figured I'd port them here too so we can finally get rid of them :)

[JosJuice]

We are trying to move away from using SharedPreferences. Could you add the setting to the new config system instead?

You'll need to add it here:

dolphin/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/model/BooleanSetting.java

Line 68 in cfb8b9b

MAIN_JOYSTICK_REL_CENTER(Settings.FILE_DOLPHIN, Settings.SECTION_INI_ANDROID,

And also here:

dolphin/Source/Core/Core/ConfigLoaders/IsSettingSaveable.cpp

Line 41 in c18abfa

static constexpr std::array<const char*, 8> android_setting_saveable = {

This will make it so the setting is saved to an INI file, letting the user carry it with them when they switch phones or switch between Play Store builds and dolphin-emu.org builds.

[BhaaLseN]

IR Mode sounds a bit like Relative Input on the Desktop version, i wonder if those could (or should?) use the same setting?

Theres also Recenter as hotkey, but nothing that does it automatically (at least i think thats the only place that has it.)

[JosJuice]

IR Mode sounds a bit like Relative Input on the Desktop version, i wonder if those could (or should?) use the same setting?

While it does sound similar, it's not actually the same. Let's say you're using relative input with a stick on a gamepad. If you hold the stick halfway to the right, a 0.5 input will be sent to InputCommon, and InputCommon will treat this as you wanting to gradually move the pointer to the right for as long as you keep the stick at 0.5. With this new setting on the other hand, we only want the cursor to move when you're dragging the finger across the screen (e.g. when the input is changing from 0.5 to 0.6). Holding the finger steady at 0.5 should result in a steady pointer.

@lynxnb Ignore the mvk-osx-m1 rendering diffs. It's an existing problem, not one caused by your change.

[lynxnb]

Sure, I'll move away from SharedPref. Also I'm up for any naming change, current names worked best in my mind but if you think they're confusing, I'll happily change them.

[JosJuice]

I think they're fine. I don't have any better suggestions personally, at least.

[JosJuice]

LGTM other than one comment.