[Kotlin] extract an alphatab.core library #2458
Description
See #2457
Currently alphaTab has "only" a Android library and we dropped the KMP setup quite a while ago. It would be better if alphaTab follows the same approach like on the .net version: Having a platform indepentent core library and a platform (android) specific integration.
This way the core lib can be used anywhere compatible.
Should be not a big effort, but rather a Kotlin project reorganization adjusting the build and publish pipeline.
We know alphaTab runs well on desktop JVMs as we run all our tests android independent.
Contributions welcome as this is currnetly in an idea state and not planned.