[stdlib][string builder] appenln function added

runtime/src/main/kotlin/kotlin/text/StringBuilderNative.kt

@@ -0,0 +1,30 @@
+/*
+ * 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 kotlin.text
+
+
+fun StringBuilder.appendln(it: String) = append(it).appendln()
+fun StringBuilder.appendln(it: Boolean) = append(it).appendln()
+fun StringBuilder.appendln(it: Byte) = append(it).appendln()
+fun StringBuilder.appendln(it: Short) = append(it).appendln()
+fun StringBuilder.appendln(it: Int) = append(it).appendln()
+fun StringBuilder.appendln(it: Long) = append(it).appendln()
+fun StringBuilder.appendln(it: Float) = append(it).appendln()
+fun StringBuilder.appendln(it: Double) = append(it).appendln()
+fun StringBuilder.appendln(it: Any?) = append(it).appendln()
+
+fun StringBuilder.appendln() = append('\n')