improve android export

misc/export/android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+	 <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.CitrineAndroid"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:screenOrientation="landscape"
+            >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

misc/export/android/Application.mk

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+APP_ABI := arm64-v8a
+APP_PLATFORM=android-16

misc/export/android/MainActivity.java

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+package com.citrine.citrineandroid;
+import org.libsdl.app.SDLActivity;
+
+
+public class MainActivity extends SDLActivity {
+    // Used to load the 'citrineandroid' library on application startup.
+}

misc/export/android/README.txt

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+
+adapt files/folders to suit your needs!
+
+AndroidStudioProjects
+├── CitrineAndroid
+│   ├── app
+│   │   ├── build/...
+│   │   ├── build.gradle.kts
+│   │   ├── jni
+│   │   │   ├── Android.mk (here, write contents: include $(call all-subdir-makefiles) )
+│   │   │   ├── Application.mk (here, put the file from this dir)
+│   │   │   ├── Citrine
+│   │   │   │   ├── Android.mk (here, put the file from this dir)
+│   │   │   │   ├── citrine.c (here, put the file from this dir)
+│   │   │   │   ├── orig -> link to Citrine source dir
+│   │   │   ├── SDL/.. (copy of SDL2/SDL - sorry...)
+│   │   │   ├── SDL2/..
+│   │   │   ├── SDL_image/..
+│   │   │   ├── SDL_mixer/..
+│   │   │   └── SDL_ttf/..
+│   │   ├── libs/..
+│   │   ├── obj/..
+│   │   ├── proguard-rules.pro (this file can be empty)
+│   │   └── src
+│   │       └── main
+│   │           ├── AndroidManifest.xml
+│   │           ├── assets/data (put your data pack here)
+│   │           ├── java/com/citrine/citrineandroid/MainActivity.Java
+│   │           └── res/... (your icons etc..)
+│   ├── build.gradle
+│   ├── gradle/...
+│   │   └── wrapper
+│   │       ├── gradle-wrapper.jar
+│   │       └── gradle-wrapper.properties
+│   ├── gradle.properties
+│   ├── gradlew
+│   ├── gradlew.bat
+│   ├── local.properties
+│   ├── settings.gradle