android: special external storage permission

- bump SDL to 2.32.0
- bump NDK to r27c
- bump AGP to 8.8.0
- bump Gradle to 8.10.2
- bump CMake to 3.31.5
- bump targetSdkVersion to 34
- add GitHub Actions Release support (Debug)
- add Special External Storage Permission support
- fix "assets not found" error on first launch
- add Android 5 & 6 support