Created module idea-test-framework and moved classes needed for idea tests there

Moved tests for completion and their test data into module idea-completion

idea/idea-completion/testData/smart/functionReference/9.kt

@@ -0,0 +1,9 @@
+abstract class C(i: Int){}
+
+fun foo(p: (Int) -> C){}
+
+fun bar(){
+    foo(<caret>)
+}
+
+// ABSENT: ::C