Encode all compiler plugin arguments for Android Extensions in kapt

Commas in option values breaks the option parsing in daemon (KT-20235).

compiler/util/src/org/jetbrains/kotlin/utils/pluginUtils.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.utils
+
+import java.io.ByteArrayInputStream
+import java.io.ObjectInputStream
+import java.util.*
+
+fun decodePluginOptions(options: String): Map<String, List<String>> {
+    val map = LinkedHashMap<String, List<String>>()
+
+    val decodedBytes = Base64.getDecoder().decode(options)
+    val bis = ByteArrayInputStream(decodedBytes)
+    val ois = ObjectInputStream(bis)
+
+    val n = ois.readInt()
+
+    repeat(n) {
+        val key = ois.readUTF()
+
+        val valueCount = ois.readInt()
+        val values = mutableListOf<String>()
+
+        repeat(valueCount) {
+            values += ois.readUTF()
+        }
+
+        map[key] = values
+    }
+
+    return map
+}