Move embeddable compiler shading logic to buildSrc, implement rewriteDeps task

the task takes a jar an a shading task (like the one that creates embeddable
compiler) and rewrites jar's dependencies to the shaded ones according the
the shade task.

prepare/compiler-embeddable/build.gradle.kts

@@ -1,44 +1,11 @@
 
-import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
-
 description = "Kotlin Compiler (embeddable)"
 
-buildscript {
-    repositories {
-        jcenter()
-    }
-
-    dependencies {
-        classpath("com.github.jengelman.gradle.plugins:shadow:${property("versions.shadow")}")
-    }
-}
-
 plugins {
     `java`
 }
 
-val compilerJar by configurations.creating
-
-val kotlinEmbeddableRootPackage = "org.jetbrains.kotlin"
-
-val packagesToRelocate =
-        listOf(
-//               "com.intellij",
-               "com.google",
-               "com.sampullara",
-               "org.apache",
-               "org.jdom",
-               "org.picocontainer",
-               "jline",
-               "gnu",
-               "javax.inject",
-               "org.fusesource")
-
 dependencies {
-    val compile by configurations
-
-    compilerJar(projectRuntimeJar(":kotlin-compiler"))
-
     compile(project(":kotlin-stdlib"))
     compile(project(":kotlin-script-runtime"))
     compile(project(":kotlin-reflect"))
@@ -46,20 +13,7 @@ dependencies {
 
 noDefaultJar()
 
-runtimeJar(task<ShadowJar>("embeddable")) {
-    destinationDir = File(buildDir, "libs")
-    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
-//    dependsOn(":kotlin-compiler:proguard")
-    from(compilerJar)
-    relocate("com.google.protobuf", "org.jetbrains.kotlin.protobuf")
-    packagesToRelocate.forEach {
-        relocate(it, "$kotlinEmbeddableRootPackage.$it")
-    }
-    relocate("org.fusesource", "$kotlinEmbeddableRootPackage.org.fusesource") {
-        // TODO: remove "it." after #KT-12848 get addressed
-        exclude("org.fusesource.jansi.internal.CLibrary")
-    }
-}
+runtimeJar(embeddableCompiler())
 
 sourcesJar()
 javadocJar()