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/tests/org/jetbrains/kotlin/code/CodeConformanceTest.kt

@@ -92,7 +92,7 @@ class CodeConformanceTest : TestCase() {
                         "%d source files contain references to package kotlin.reflect.jvm.internal.impl.\n" +
                         "This package contains internal reflection implementation and is a result of a " +
                         "post-processing of kotlin-reflect.jar by jarjar.\n" +
-                        "Most probably you meant to use classes from org.jetbrains.kotlin.** or com.google.protobuf.**.\n" +
+                        "Most probably you meant to use classes from org.jetbrains.kotlin.**.\n" +
                         "Please change references in these files or exclude them in this test:\n%s",
                         { source ->
                             "kotlin.reflect.jvm.internal.impl" in source