Introduce module 'reflection', move KFunctionN to it

Metadata for KFunction classes is now longer serialized along with built-in
classes. This effectively means that it's no longer possible to find KFunction
classes via dependency on built-ins. There should be a kotlin-runtime library
in the specified classpath for reflection types to be resolvable.

A lot of tests were moved and changed, because tests on callable references
require stdlib in classpath from now on

compiler/testData/codegen/boxWithStdlib/callableReference/function/local/captureOuter.kt

@@ -0,0 +1,12 @@
+class Outer {
+    val result = "OK"
+
+    inner class Inner {
+        fun foo() = result
+    }
+}
+
+fun box(): String {
+    val f = Outer.Inner::foo
+    return Outer().Inner().f()
+}