Integrate serialization plugin into big Kotlin plugin

Split import handlers into multiple files
Add empty Maven handler for Android Studio

Add testRuntime dependency on kx-serialization-plugin for all modules which require compiler
plugins in test classpath

libraries/ReadMe.md

@@ -42,31 +42,3 @@ If your maven build is failing with Out-Of-Memory errors, set JVM options for ma
 
     MAVEN_OPTS="-Xmx2G"
 
-
-
-## Kotlin serialization Gradle Plugin
-
-First, build all the above. Then run `./gradlew :kotlinx-gradle-serialization-plugin:publishToMavenLocal` to install it to your local maven repository.
-
-When it is installed in local maven repository, you can add it as a dependency in buildscript classpath and apply it:
-
-```
-buildscript {
-
-    repositories {
-        mavenLocal()
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.1-SNAPSHOT"
-        classpath "org.jetbrains.kotlinx:kotlinx-gradle-serialization-plugin:0.1"
-    }
-}
-
-apply plugin: 'kotlin'
-apply plugin: 'kotlinx-serialization'
-
-```
-
-You can also obtain it from bintray: https://bintray.com/kotlin/kotlinx/kotlinx.serialization.plugin