Introduce Gradle models for plugins 'kotlin-allopen', 'kotlin-noarg' and
'kotlin-sam-with-receiver'. Corresponding model builders are registered
in each one of those plugin main classes.
Add option to disable signing (-PnoSign), to be used when publishing
pre-built artifacts
Add option to define specific version for publishing, to be used when
publishing test versions
(cherry picked from commit dcd55e9)
* Add gradle-tools subproject
* Add Gradle buildscripts to the related projects
* Remove the projects from the libraries pom.xml
* Move AndroidGradleWrapper.groovy to separate source root
* Changed artifact dependencies to project dependencies where needed
* Extract common configuration into commonConfiguration.gradle
* (convert functions to closures to be able to call them)
* Refactor DSL usage
* Replace `project.properties` with `findProperty`
* Unify Gradle wrapper between `libraries` and `gradle-tools`
(as a temporary solution, just made the wrapper files the same)