[FL-1958] U2F prototype (#879)

* U2F implementation prototype
* U2F data encryption and store, user confirmation request
* remove debug prints
* fix notification bug in chrome
* split u2f_alloc into u2f_init and u2f_alloc
* typo fix, furi-hal-trng -> furi-hal-random
* rand/srand redefinition
* SubGhz: a little bit of Dante.
* u2f_data naming fix

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

firmware/targets/furi-hal-include/furi-hal-random.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Get random value
+ *
+ * @return     random value
+ */
+uint32_t furi_hal_random_get();
+
+/** Fill buffer with random data
+ *
+ * @param      buf  buffer pointer
+ * @param      data buffer len
+ */
+void furi_hal_random_fill_buf(uint8_t* buf, uint32_t len);
+
+#ifdef __cplusplus
+}
+#endif