KT-6891 Type argument of generic type before dot is not resolved

KT-7373 Type parameter names are not suggested
KT-6838 Class declared in same file is not suggested in completion

 #KT-6891 Fixed
 #KT-7373 Fixed
 #KT-6838 Fixed

idea/testData/resolve/references/TypeArgumentBeforeDot.kt

@@ -0,0 +1,11 @@
+class Generic<T> {
+    class Nested
+}
+
+class C {
+    val prop: Generic<<caret>Foo>.Nested? = null
+}
+
+class Foo
+
+// REF: (<root>).Foo