Support newer Gradle versions

[Fabi755]

As in reported in #384 and changes already requested in #382, here a few changes to fix support for newer Gradle & Android versions.

• fixes #310
• fixes #384

This PR provide the minimal changes to support current Gradle and AGP versions. No library or plugin is updated.

• The package field in AndroidManifest is now auto-generated and the namespace configuration in the build.gradle is required since AGP 8.0
• I remove the AndroidManifest while there is now empty and useless
• I also added missing Kotlin JVM options, that was causing me failed builds
• Finally I removed a duplicated Gradle configuration

[Fabi755]

Can you bump the compile SDK to 34 in the same go?

Done. I think we should upgrade the Gradle wrapper, build tools and other dependencies. But maybe in a follow up PR.

[smallTrogdor]

Thanks for the changes and I guess it made sense to separate this form the other changes I made in #382 - I am however not the biggest fan of this construct to support old AGP versions forever. As soon as this package will allow for breaking changes, this should be done imO.

[kuhnroyal]

I agree.