Enable states for 3DS games

[StevenPZChan]

Disclamer
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Is your feature request related to a problem? Please describe.
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I think it will be great to have states save/load for 3DS games, since sometimes the timespan between two save points could be really long and that's frustrated.

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I think we are using Citra core for 3DS games, and it already support states save/load. But still we disabled it here

Lemuroid/retrograde-app-shared/src/main/java/com/swordfish/lemuroid/lib/library/GameSystem.kt

Line 1209 in e070950

statesSupported = false,

which I wonder why and could we re-enable it now?

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BTW, is this project still under development? When will we establish a newer release?