Deprecated Gradle setup

[matfax]

Since Gradle 4.x, there are new recommendations for dependencies.

Compile is deprecated

Configuration 'compile' is obsolete and has been replaced with 'implementation'

Annotation processor is deprecated

Execution failed for task ':app:javaPreCompileDebug'.
Annotation processors must be explicitly declared now. The following dependencies on the compile classpath are found to contain annotation processor. Please add them to the annotationProcessor configuration.
- jetified-classindex-3.4.jar (org.atteo.classindex:classindex:3.4)
Alternatively, set android.defaultConfig.javaCompileOptions.annotationProcessorOptions.includeCompileClasspath = true to continue with previous behavior. Note that this option is deprecated and will be removed in the future.
See https://developer.android.com/r/tools/annotation-processor-error-message.html for more details.

[matfax]

I've migrated this project to Kotlin, also reenabling Gradle and annotation processor support using kapt:
matfax/klassindex

[sentinelt]

Great job!