#331 remove remaining runtime dependencies from processor to mapstruct core, add checkstyle rule to verify that for the future.
#262 prefix processor options with 'mapstruct.'
Remove maven-processor-plugin from integrationtest module, as it's not required there anymore
#355 shade away freemarker in mapstruct-processor, build an uber-jar containing the processor and the required freemarker classes and publish a dependency-reduced pom.