Add Android support and fix GLES renderer/audio compatibility

[Simon358]

This PR introduces several critical fixes to enable the Android port to build, launch, and run with stable graphics and audio.

1. Build System & Dependency Fixes
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   Gradle Downgrade: Updated gradle-wrapper.properties to use Gradle 8.7. This resolves a "configuration mutation" error caused by an incompatibility between Gradle 9.x and Android Gradle Plugin 8.2.2.
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   Missing Assets: Updated app/build.gradle to include external SDL resource directories in the sourceSets, fixing a resource linking error (ic_launcher not found).
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   Library Bundling: Modified CMakeLists.txt to build SDL3 as a shared library (SDL_SHARED ON), ensuring libSDL3.so is correctly bundled into the APK for runtime linking.
2. Graphics & Renderer Improvements (OpenGL ES Support)
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   Mobile-Native Context: Updated NativeRenderer_InitialiseGLContext to request an OpenGL ES 3.0 context on Android instead of the desktop-only OpenGL 3.3 Core profile.
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   GLES-Compatible Function Loading: Switched NativeRenderer_InitialiseGLExt to use SDL_GL_GetProcAddress on Android, allowing SDL to handle cross-platform function resolution for mobile drivers.
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   Desktop-to-Mobile Readback Fix: Replaced desktop-only glGetTexImage calls with a glReadPixels implementation using framebuffers. This was necessary as glGetTexImage is not available in the OpenGL ES specification.
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   Format & Precision:
   ◦
   Changed internal VRAM format to GL_RG8 on Android to match 8-bit component expectations of mobile GPUs.
   ◦
   Increased shader integer precision to mediump to prevent indexing artifacts on mobile hardware.
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   Feature Gating: Wrapped glPolygonMode (desktop-only) in an #ifndef ANDROID block to prevent crashes.
3. Audio Fixes
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   Driver Selection: Updated NativeAudio_SelectDriverHint to skip Linux-specific sound system hints (alsa, pulseaudio) when running on Android, allowing SDL to correctly initialize the mobile audio driver.
   •
   Logcat Integration: Replaced standard printf/fprintf calls in the audio subsystem with Platform_Log to ensure audio initialization and error messages are visible in Android's Logcat.

[kkv0n]

hmm with graphics changes i am mostly worried about the render changes since we optimized it recently, having the bottleneck back would be terrible D:

[aalhendi]

Closing as duplicate in favor of #41