Kotlin

Add Kotlin Spring compiler plugin to module build  

Adds Spring Kotlin compiler plugin to project build files:.

Incompatible with Spring class modifier  

Spring component classes could be implicitly subclassed and must not be final.

Java-style call with Kotlin extension alternative  

Reports places where a Kotlin Spring extension can be used instead of a call with a ::class.java argument.

Spring Kotlin router DSL  

Reports unused path variables in Kotlin router DSL as well as usages of undeclared path variables.