fix hf mf sim (issue #412) (#419)

* move to separate files mifaresim.[ch]
* check CRC of commands
* don't execute commands without successfull authentication
* ensure correct timing of REQA, WUPA, ANTICOL and SELECT responses
* trace reader commands immediately, only fix start time after tag response. Decreases time to be ready for next reader command.
* remove iso14443-4 remnants
* trace raw reader commands instead of decrypted ones
* some refactoring

* fix hf mf sim
* timing: decrease time to get ready for new reader commands

armsrc/BigBuf.c

@@ -136,6 +136,10 @@ void set_tracing(bool enable) {
 	tracing = enable;
 }
 
+bool get_tracing(void) {
+	return tracing;
+}
+
 /**
  * Get the number of bytes traced
  * @return