gamemode: Add gamemode config

modules/programs/gamemode/default.nix

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+{ ... }:
+
+{
+  home-manager.users.alexander.xdg.configFile = {
+    "gamemode/gamemode.ini".source = ./gamemode.ini;
+  };
+}

modules/programs/gamemode/gamemode.ini

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+[general]
+reaper_freq=5
+desiredgov=performance
+; TODO: Maybe set this
+;defaultgov=powersave
+
+; The iGPU desired governor is used when the integrated GPU is under heavy load
+igpu_desiredgov=powersave
+igpu_power_threshold=0.3
+
+softrealtime=on;
+renice=0
+ioprio=0
+inhibit_screensaver=1
+
+[filter]
+; If "whitelist" entry has a value(s)
+; gamemode will reject anything not in the whitelist
+;whitelist=RiseOfTheTombRaider
+
+; Gamemode will always reject anything in the blacklist
+;blacklist=HalfLife3
+;    glxgears
+
+[gpu]
+
+[supervisor]
+
+[custom]