"Blank lines after class header" option supported

idea/testData/formatter/BlankLinesAfterClassHeader.after.kt

@@ -0,0 +1,28 @@
+class Foo {
+    fun bar() {
+    }
+}
+
+object Bar {
+    fun xyzzy() {
+    }
+}
+
+val f = object {
+    fun foo() {}
+}
+
+class FooM
+    : IFoo {
+
+    fun bar()
+}
+
+class FooC(
+        val x: String
+) {
+
+    fun bar()
+}
+
+// SET_INT: BLANK_LINES_AFTER_CLASS_HEADER = 1

idea/testData/formatter/BlankLinesAfterClassHeader.kt

@@ -0,0 +1,26 @@
+class Foo {
+    fun bar() {
+    }
+}
+
+object Bar {
+    fun xyzzy() {
+    }
+}
+
+val f = object {
+    fun foo() {}
+}
+
+class FooM
+    : IFoo {
+    fun bar()
+}
+
+class FooC(
+        val x: String
+) {
+    fun bar()
+}
+
+// SET_INT: BLANK_LINES_AFTER_CLASS_HEADER = 1