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/diagnostics/testsWithStdLib/callableReference/function/constructorFromClass.kt

@@ -0,0 +1,15 @@
+class A {
+    fun main() {
+        val x = ::A
+
+        x : KFunction0<A>
+    }
+}
+
+class SomeOtherClass {
+    fun main() {
+        val x = ::A
+
+        x : KFunction0<A>
+    }
+}