IDs: Introduce ID handling functions and data

IDs will be needed by multiple subsystems, so introduce the needed
variables and handling functions.

include/IDs.h

@@ -0,0 +1,37 @@
+//
+// Created by Teo-CD on 19/10/23.
+//
+
+#ifndef JIN_BARBAPAPA_IDS_H
+#define JIN_BARBAPAPA_IDS_H
+
+#include <Arduino.h>
+
+/***
+ * Convenience functions and variables to handle IDs and data that they link to.
+ */
+
+constexpr uint8_t idMaskGone = 0b10000000;
+constexpr uint8_t idMaskChar = 0b01000000;
+
+bool isIdGone(int8_t ID);
+bool isIdCharacter(int8_t ID);
+/***
+ * Get the ID without the control bits : direction and character/promotion bit.
+ * @param ID to check, with all bits
+ * @return The ID with only index bits.
+ */
+uint8_t getRawId(int8_t ID);
+/***
+ * Checks if the ID is known to the firmware, either as a character or promotion.
+ * @param ID to check, with all bits
+ * @return True if valid as a character or promotion, false otherwise.
+ */
+bool isValidId(int8_t ID);
+
+static constexpr uint8_t dirStrSize = 10;
+extern const char promoDirs[][dirStrSize];
+extern const char charDirs[][dirStrSize];
+
+
+#endif //JIN_BARBAPAPA_IDS_H

include/RFID.h

@@ -15,6 +15,7 @@
 #include <MFRC522DriverPinSimple.h>
 #include <MFRC522DriverSPI.h>
 
+#include "IDs.h"
 #include "Pinout.h"
 
 /***