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/weighers/smart/NullableExpected.kt

@@ -0,0 +1,20 @@
+var global: C = C()
+
+abstract class C {
+    companion object {
+        val INSTANCE = C()
+    }
+}
+
+fun foo(p: C?) {
+    val local = C()
+    foo(<caret>)
+}
+
+
+// ORDER: p
+// ORDER: local
+// ORDER: global
+// ORDER: INSTANCE
+// ORDER: object
+// ORDER: null