KT-4075: properties with overloaded setters

[eskatos]

The Gradle API rely a lot on overloaded setters.
Kotlin support for such constructs and proper integration with Java declarations would make for a nicer DSL.

https://youtrack.jetbrains.com/issue/KT-4075

[mkobit]

I think this is more important with the introduction of Property and PropertyState types in Gradle core with the desire to not create a bunch of cruft in the Kotlin DSL. That is unless those are going to be used directly as task inputs or outputs in the future.

[mkobit]

Should the Property.set versus Groovy DSL decoration to work for = be split out in a different issue?

[bamboo]

The issue was broken down further and the Java interop aspect, more relevant to us, extracted to KT-24831 so it could be fixed sooner.