The issue has been discovered with plain java projects that seems gradle evaluate differently than android projects. All plugin configuration extension properties were ignored because they were accessing too soon. This PR wraps plugin extension properties with `Property` class to provide lazy evaluation for tasks during their execution. By using `Property` wrapper the min required version of gradle is bumped to 4.+. Some classes were converted back to groovy, that is done intentionally as there is some `black magic` is going on by gradle generating additional code for properties.