android: Add the ability to edit touch controls overlay without opening a game

[ptyfyre]

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Adds a new RunnableSettings which launches emulation in sort of a "gameless state" and allows editing the input overlay without having to actually open a game, the overlay then can be edited as usual and once the user is done, the emulator returns to the SettingsActivity

Also added a new input overlay settings section which has the RunnableSetting and a simple enable boolean for the overlay (reflects the emulationMenu one)
This can be extended later to possibly have more settings like an auto hide for the overlay and so on...

[DavidRGriswold]

Just tested this. Works well, but not having access to the menu when in edit mode means that you can't add/remove controls or change sizes. It should be fully featured before merging. Not sure the best way to do that other than perhaps re-implementing the side menu with only the overlay controls?

[ptyfyre]

Just tested this. Works well, but not having access to the menu when in edit mode means that you can't add/remove controls or change sizes. It should be fully featured before merging. Not sure the best way to do that other than perhaps re-implementing the side menu with only the overlay controls?

I plan to fix that in the future with a pop-up menu when you click the buttons in this mode, but if this won't get merged until then, maybe it would be a wise idea to convert it to a draft.

I would prefer to have merged as an "Part 1" of sorts.