Moved current incremental compiler test data into subdirectory.

Tweaked test generator to avoid creating test methods for parent directory of tests.

jps-plugin/testData/incremental/pureKotlin/annotations/annotations.kt

@@ -0,0 +1,13 @@
+package test
+
+annotation class Anno
+
+[Anno] fun f() {
+}
+
+[Anno] val v1 = ""
+
+var v2: String
+    get() = ""
+    [Anno] set(value) {
+    }