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

build.xml

@@ -565,7 +565,7 @@
           </sequential>
         </macrodef>
 
-        <new_kotlinc src="${basedir}/core/builtins/src${path.separator}${basedir}/core/runtime.jvm/src"
+        <new_kotlinc src="${basedir}/core/builtins/src${path.separator}${basedir}/core/runtime.jvm/src${path.separator}${basedir}/core/reflection/src"
                      output="${output}/classes/runtime"
                      classpath="${basedir}/core/builtins/src${path.separator}${basedir}/core/runtime.jvm/src"/>
 
@@ -598,6 +598,7 @@
             <fileset dir="${basedir}/core/builtins/native" includes="**/*"/>
             <fileset dir="${basedir}/core/builtins/src" includes="**/*"/>
             <fileset dir="${basedir}/core/runtime.jvm/src" includes="**/*"/>
+            <fileset dir="${basedir}/core/reflection/src" includes="**/*"/>
             <fileset dir="${basedir}/libraries/stdlib/src" includes="**/*"/>
             <zipfileset file="${kotlin-home}/build.txt" prefix="META-INF"/>