Support for non Android gradle modules

My android project has some pure Java sub-modules.

It would be great to be able to use Hugo with those as well.
This could likely be done by having Hugo log to slf4j-api instead of android.util.Log.

The issue names no files or tests. Start by tracing Hugo's Android logging path and Gradle module setup, especially the use of android.util.Log and the suggested slf4j-api replacement. Done means Hugo can be used in a pure Java Gradle sub-module and still logs method calls.

Written by the indexing model from the issue text.