fix: Add gamemode API config

app_pojavlauncher/src/main/AndroidManifest.xml

@@ -21,7 +21,8 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC"/>
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE"/>
     <uses-permission android:name="android.permission.VIBRATE" />
-
+    <meta-data android:name="android.game_mode_config"
+        android:resource="@xml/game_mode_config" />
     <application
         android:name=".PojavApplication"
         android:allowBackup="true"

app_pojavlauncher/src/main/res/xml-v33/game_mode_config.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Disables OEM "optimizations" because we tell it "we'll apply our own, trust".-->
+<game-mode-config
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:allowGameDownscaling="false"
+    android:allowGameFpsOverride="false"
+    android:supportsBatteryGameMode="true"
+    android:supportsPerformanceGameMode="true"
+    />