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/ifValue/4.kt

@@ -0,0 +1,12 @@
+fun foo(s: String){}
+fun foo(c: Char){}
+
+val xxx: XXX
+
+fun bar(b: Boolean, s: String, c: Char){
+    foo(if (b) xxx else <caret>)
+}
+
+// EXIST: s
+// EXIST: c
+// ABSENT: b