shell: Add 'status' command to issue STATUS APDU

This can be used to get the FCP of the currently selected file.

Change-Id: I65c97adadd831ca2daa5a0dbb52a37999f8514fd
diff --git a/pySim/filesystem.py b/pySim/filesystem.py
index 8cdb23e..aaf333b 100644
--- a/pySim/filesystem.py
+++ b/pySim/filesystem.py
@@ -1145,6 +1145,11 @@
 
         return select_resp
 
+    def status(self):
+        """Request STATUS (current selected file FCP) from card."""
+        (data, sw) = self.card._scc.status()
+        return self.selected_file.decode_select_response(data)
+
     def read_binary(self, length:int=None, offset:int=0):
         """Read [part of] a transparent EF binary data.