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/basic/common/InClassPropertyAccessor.kt

@@ -0,0 +1,9 @@
+class Test(val testParam : Int) {
+  val x : Int get() {
+      val test = 12
+      return te<caret>
+  }
+}
+
+// EXIST: test
+// EXIST: testParam