update project

[jperedadnr]

Update project files (Gradle files, scripts)

Fixes #6

[nlisker]

During the build I get these warnings:

> Task :library:compileDebugJavaWithJavac
warning: [options] source value 8 is obsolete and will be removed in a future release

warning: [options] target value 8 is obsolete and will be removed in a future release
> Task :library:mergeDebugGeneratedProguardFiles
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.

And this error:

FAILURE: Build failed with an exception.
> Task :library:bundleDebugAar
* What went wrong:finished
Execution failed for task ':log:androidBuild'.
> A problem occurred starting process 'command '/home/nlisker/.gluon/substrate/Android/ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang''
> Task :log:androidBuild FAILEDd

I checked the path above and there's a directory missing in it denoting the version:
/home/nlisker/.gluon/substrate/Android/ndk/25.2.9519653/toolchains/llvm/prebuilt/linux-x86_64/bin/clang
This was created by GluonFX, I didn't download the ndk manually.

Also note that in the documentation, the ndk path is named ndk-bundle, but I think it's only named that if it's installed from Android Studio while GluonFX just uses ndk.