Fixed Wrong files getting detected as persons

Added HardwareSerial* as parameter to print person
Fixed bug in check for file

Added RFID and Finger revoke mechanisms
Added user scan
Added set user credits
Enabled creditsystem

beerbox.h

@@ -1,4 +1,3 @@
-#define NUM_OF_PEOPLE 25  // This is (thank myself) not used
 #define NUM_OF_DRINKS 10
 #define DRINK_NAME_MAX_LENGTH 13
 #define FILE_NAME_LEN 8
@@ -31,8 +30,10 @@ typedef struct{
 typedef struct{
   Drink drinks[NUM_OF_DRINKS];
   int waiting;
+  int scanning=0;
   int maxDrink=0;
   int maxID=0;
+  int personCount=0;
 }Beerbox;
 
 //this shall always just exist in a short term!
@@ -42,7 +43,7 @@ typedef struct{
   char name[NAME_LEN + 1];
   char rfid_uuid[13];
   uint8_t finger_uuid;
-  uint8_t credits_left;
+  int credits_left;
 }Person;