Initial implementation of method separators

#KT-13029 Fixed

idea/testData/codeInsight/lineMarker/MethodSeparators.kt

@@ -0,0 +1,37 @@
+// METHOD_SEPARATORS
+
+class Foo {
+    object BarObj {
+    }
+
+    fun bar() {
+
+    }
+
+    <lineMarker descr="null">fun</lineMarker> baz() {
+        class FooLocal {
+        }
+
+        fun fooLocal() {
+        }
+
+        <lineMarker descr="null">fun</lineMarker> barLocal() {
+        }
+
+        val xLocal = run {
+            "x"
+        }
+    }
+
+    <lineMarker descr="null">val</lineMarker> x = 0
+
+    <lineMarker descr="null">val</lineMarker> y: Int
+        get() = 0
+
+    <lineMarker descr="null">val</lineMarker> z = run {
+        "abc"
+    }
+
+    <lineMarker descr="null">fun</lineMarker> quux() {}
+    fun xyzzy() {}
+}