Android: Convert SharedPreferences to INI Settings (simple cases)

[Ebola16]

Part of https://bugs.dolphin-emu.org/issues/10957

This will allow some settings to be retained across Dolphin builds. Other PRs will handle more involved SharedPreferences changes.

I'm aware that globally getting settings will come out soon but I figured I should submit this for review before I proceed further.

Note: Android: wiiController is implemented in #8894 and orientation is implemented in #9089.

[Ebola16]

Feel free to review / merge this at any time. I'll occasionally work on the more complicated INI conversions and if I figure them out I'll commit them here, like the latest commit.

[JosJuice]

I'd much rather prefer to not have the number of settings migrated by this PR increase, otherwise this PR becomes harder for me to review the more time passes, which is kind of the opposite of how it usually works. I would suggest that you remove the ISOPaths commit from this PR so that I can approve it sooner.

[Ebola16]

That's fair, most PR merges I've done are to avoid conflicts with my other PRs.

[JosJuice]

We should probably call mSettings.saveSettings here, so that settings will persist the next time the user runs the app:

dolphin/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/activities/EmulationActivity.java

Lines 325 to 328 in 5a939cc

	if (!isChangingConfigurations())
	{
	mEmulationFragment.saveTemporaryState();
	}