Insert imports on copy/paste

Introduce KotlinCopyPasteReferenceProcessor

idea/testData/copyPaste/imports/NoImportForSamePackage.kt

@@ -0,0 +1,56 @@
+package a
+
+import a.E.ENTRY
+import a.Outer.*
+
+trait T
+
+class A(i: Int) {}
+
+val c = 0
+
+fun g(a: A) {}
+
+fun A.ext() = A()
+
+object O1 {
+    fun f() {
+    }
+}
+
+object O2 {
+}
+
+enum class E {
+    ENTRY
+}
+
+class Outer {
+    inner class Inner {
+    }
+    class Nested {
+    }
+    enum class NestedEnum {
+    }
+    object NestedObj {
+    }
+    trait NestedTrait {
+    }
+    annotation class NestedAnnotation
+}
+
+class ClassObject {
+    class object {
+    }
+}
+
+<selection>fun f(a: A, t: T) {
+    g(A(c).ext())
+    O1.f()
+    O2
+    ENTRY
+}
+
+fun f2(i: Inner, n: Nested, e: NestedEnum, o: NestedObj, t: NestedTrait, a: NestedAnnotation) {
+    ClassObject
+}</selection>