add references to kdoc; support resolve and rename

idea/testData/kdoc/resolve/CodeReference.kt

@@ -0,0 +1,8 @@
+/**
+ * This is the same as [<caret>bar]
+ */
+fun foo() {}
+
+fun bar() {}
+
+// REF: (in <root>).bar()

idea/testData/kdoc/resolve/ImportedClassReference.kt

@@ -0,0 +1,10 @@
+import java.util.Properties
+
+/**
+ * This is almost like [Propert<caret>ies]
+ */
+class C {
+
+}
+
+// REF: (java.util).Properties

idea/testData/kdoc/resolve/ParamReference.kt

@@ -0,0 +1,6 @@
+/**
+ * @param <caret>s this is a string
+ */
+fun f(s: String) { }
+
+// REF: s

idea/testData/kdoc/resolve/PropertyTypeParamReference.kt

@@ -0,0 +1,6 @@
+/**
+ * The type [<caret>T] is the type on which the foo property is defined.
+ */
+val <T> T.foo: Int get() = 0
+
+// REF: T

idea/testData/kdoc/resolve/QualifiedCodeReference.kt

@@ -0,0 +1,10 @@
+/**
+ * This is the same as [C.<caret>bar]
+ */
+fun foo() {}
+
+class C {
+    fun bar() {}
+}
+
+// REF: (in C).bar()

idea/testData/kdoc/resolve/TypeParamReference.kt

@@ -0,0 +1,6 @@
+/**
+ * @param <caret>T this is the type
+ */
+class Foo<T> {}
+
+// REF: T