move Runtime{State,Lchan} from pySim.filesystem to new pySim.runtime

Those two are really separate concepts, so let's keep them in separate
source code files.

Change-Id: I9ec54304dd8f4a4cba9487054a8eb8d265c2d340
diff --git a/pySim/sysmocom_sja2.py b/pySim/sysmocom_sja2.py
index 1bd4a8a..bfd0ff5 100644
--- a/pySim/sysmocom_sja2.py
+++ b/pySim/sysmocom_sja2.py
@@ -21,6 +21,7 @@
 from struct import pack, unpack
 from pySim.utils import *
 from pySim.filesystem import *
+from pySim.runtime import RuntimeState
 from pySim.ts_102_221 import CardProfileUICC
 from pySim.construct import *
 from construct import *