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/It.kt

@@ -0,0 +1,13 @@
+fun foo(xx: String){}
+
+fun bar(handler: (String) -> Unit){}
+
+fun f() {
+    val v = ""
+    val xx = ""
+    bar { foo(<caret>) }
+}
+
+// ORDER: xx
+// ORDER: it
+// ORDER: v