Basic support for EAC documents (e.g. German Identification Card)

-new files armsrc/epa.[ch] for ePA (electronic "Personalausweis") related functions
    -Offers elementary functions (EPA_PACE_MSE_Set_AT etc.)
    -Also offers one new USB command: EPA_PACE_Collect_Nonce
-created new command subtree in client: client/hfepa.[ch] ("hf epa")
    -offers "hf epa cnonces" (collect encrypted PACE nonces)
-more to come

client/cmdhfepa.h

@@ -0,0 +1,18 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2012 Frederik Möllers
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Commands related to the German electronic Identification Card
+//-----------------------------------------------------------------------------
+
+#ifndef CMDHFEPA_H__
+#define CMDHFEPA_H__
+
+int CmdHFEPA(const char *Cmd);
+
+int CmdHFEPACollectPACENonces(const char *Cmd);
+
+#endif // CMDHFEPA_H__