Rewritten KDoc-link resolve and completion to work more reasonably

idea/testData/kdoc/resolve/CheckExtensionReceiver.kt

@@ -0,0 +1,13 @@
+class Foo
+class Bar
+
+fun Foo.foo(){}
+
+fun foo(){}
+
+/**
+ * [Bar.<caret>foo]
+ */
+fun test() {}
+
+// REF_EMPTY

idea/testData/kdoc/resolve/ExtensionFromImports.kt

@@ -0,0 +1,10 @@
+import kotlin.io.extension
+import java.io.File
+
+/**
+ * [File.<caret>extension]
+ */
+fun f() {
+}
+
+// REF: (for java.io.File in kotlin.io).extension

idea/testData/kdoc/resolve/ExtensionFun.kt

@@ -0,0 +1,14 @@
+package a
+
+class B {
+    /**
+     * [a.B.<caret>ext]
+     */
+    fun member() {
+    }
+}
+
+fun B.ext() {
+}
+
+// REF: (for B in a).ext()

idea/testData/kdoc/resolve/ExtensionNonQualified.kt

@@ -0,0 +1,10 @@
+class Foo
+
+fun Foo.foo(){}
+
+/**
+ * [<caret>foo]
+ */
+fun test() {}
+
+// REF: (for Foo in <root>).foo()

idea/testData/kdoc/resolve/ExtensionVal.kt

@@ -0,0 +1,14 @@
+package a
+
+class B {
+    /**
+     * [a.B.<caret>extVal]
+     */
+    fun member() {
+    }
+}
+
+val B.extVal: String
+    get() = ""
+
+// REF: (for B in a).extVal

idea/testData/kdoc/resolve/OnlyMembersFromClass.kt

@@ -0,0 +1,8 @@
+class Foo
+
+/**
+ * [Foo.<caret>test]
+ */
+fun test() {}
+
+// REF_EMPTY