This fixes the bug that the USB communication breaks when collecting PACE nonces with no delay. The delay functionality has not been removed (it doesn't hurt to keep it), but using a delay of 0 is now possible without a high risk of getting too many errors.
-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