wip: more functionality and cleanup

app/src/main/res/drawable-nodpi/euro_5000.png

...onvention/src/main/kotlin/AndroidApplicationConvention.kt

...le/convention/src/main/kotlin/AndroidLibraryConvention.kt

gradle/libs.versions.toml

persistence/build.gradle.kts

...oom/schemas/de.chaosdorf.meteroid.MeteroidDatabase/1.json

...src/main/kotlin/de/chaosdorf/meteroid/MeteroidDatabase.kt

...ence/src/main/kotlin/de/chaosdorf/meteroid/model/Drink.kt

...e/src/main/kotlin/de/chaosdorf/meteroid/model/Purchase.kt

...tence/src/main/kotlin/de/chaosdorf/meteroid/model/User.kt