Support LACT profile switch

[Atemu]

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Power-managing GPUs on Linux is hard and you currently must make the trade-off between power efficiency and VRR working properly on AMDGPU.

LACT allows controlling the power management aswell as fan curves etc. With the most recent version, it has gained support for profiles that can be switched dynamically.

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Gamemode should be able to toggle between two LACT profiles: Desktop and Gaming. It'd switch to the designated gaming profile when the game starts and back to the desktop profile when it's stopped. The names of the profiles should be customisable.

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LACT offers a solid socket API that could (and should) be used to implement this https://github.com/ilya-zlobintsev/LACT/blob/master/API.md

[Frozen-byte]

You may want to have a look at version 0.7.0 with the Automatic Profile switcher: ilya-zlobintsev/LACT#424