Insert empty lines after functions and properties (KT-4002)

#KT-4002 Fixed

idea/testData/formatter/EmptyLineBetweenClasses.kt

@@ -0,0 +1,19 @@
+class A
+class B
+class C {
+
+}
+class D {
+
+}
+class E
+    : Some
+class F
+
+fun some() = 1
+class G
+fun some() = 1
+
+val a = 1
+class H
+val b = 1