NFC refactoring (#3050)

"A long time ago in a galaxy far, far away...." we started NFC subsystem refactoring.

Starring:

- @gornekich - NFC refactoring project lead, architect, senior developer
- @gsurkov - architect, senior developer
- @RebornedBrain - senior developer

Supporting roles:

- @skotopes, @DrZlo13, @hedger - general architecture advisors, code review
- @Astrrra, @doomwastaken, @Hellitron, @ImagineVagon333 - quality assurance

Special thanks:

@bettse, @pcunning, @nxv, @noproto, @AloneLiberty and everyone else who has been helping us all this time and contributing valuable knowledges, ideas and source code.

lib/nfc/helpers/nfc_util.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void nfc_util_num2bytes(uint64_t src, uint8_t len, uint8_t* dest);
+
+uint64_t nfc_util_bytes2num(const uint8_t* src, uint8_t len);
+
+uint8_t nfc_util_even_parity32(uint32_t data);
+
+uint8_t nfc_util_odd_parity8(uint8_t data);
+
+void nfc_util_odd_parity(const uint8_t* src, uint8_t* dst, uint8_t len);
+
+#ifdef __cplusplus
+}
+#endif