feat(android): add support for building SDL2/libarmsx for Android

- Updated .gitignore to include Android native libraries and dependencies.
- Modified android/app/build.gradle to register a new task for preparing native binaries.
- Enhanced build.sh to support building SDL2/libarmsx for Android, including NDK setup and BIOS handling.
- Refactored iOS AppDelegate to integrate RNOverlayController and EmulatorRunner for better overlay management.
- Introduced EmulatorRunner class to handle the emulator lifecycle and argument passing.
- Created RNOverlayController to manage the React Native overlay, including mounting and unmounting logic.
- Updated Xcode project files to reflect new source files and dependencies.

android/app/build.gradle

@@ -65,6 +65,7 @@ android {
             java.srcDirs += ['../../third_party/SDL/android-project/app/src/main/java']
             res.srcDirs += ['src/main/res', '../../third_party/SDL/android-project/app/src/main/res']
             assets.srcDirs += ['src/main/assets']
+            jniLibs.srcDirs += ['src/main/jniLibs']
         }
     }
 }
@@ -87,3 +88,21 @@ dependencies {
     implementation 'com.facebook.react:react-android:0.76.0'
     implementation 'com.facebook.react:hermes-android:0.76.0'
 }
+
+def repoRootDir = rootProject.projectDir.parentFile
+def nativeOutput = file("$projectDir/src/main/jniLibs/arm64-v8a/libarmsx.so")
+
+tasks.register("prepareNativeBinaries") {
+    group = "native"
+    description = "Build SDL2/libarmsx via build.sh android."
+    inputs.file(new File(repoRootDir, "build.sh"))
+    outputs.file(nativeOutput)
+    doLast {
+        exec {
+            workingDir repoRootDir
+            commandLine "./build.sh", "android"
+        }
+    }
+}
+
+preBuild.dependsOn(tasks.named("prepareNativeBinaries"))