Use protobuf with renamed packages, pack to IDEA plugin

Update GenerateProtoBuf.kt to also regexp-replace com.google.protobuf with
org.jetbrains.kotlin.protobuf in generated Java sources

 #KT-12581 Fixed

compiler/compiler.pro

@@ -74,6 +74,10 @@ messages/**)
     public protected *;
 }
 
+-keep class org.jetbrains.kotlin.protobuf.** {
+    public protected *;
+}
+
 -keep class org.jetbrains.kotlin.codegen.intrinsics.IntrinsicArrayConstructorsKt { *; }
 
 -keep class org.jetbrains.org.objectweb.asm.Opcodes { *; }