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/longQualifiedName.kt

@@ -0,0 +1,15 @@
+// FILE: a.kt
+
+package a.b.c
+
+class D {
+    fun foo() = 42
+}
+
+// FILE: b.kt
+
+fun main() {
+    val x = a.b.c.D::foo
+
+    x : KMemberFunction0<a.b.c.D, Int>
+}