[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>

applications/u2f/u2f_hid.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <furi.h>
+#include "u2f.h"
+
+typedef struct U2fHid U2fHid;
+
+U2fHid* u2f_hid_start(U2fData* u2f_inst);
+
+void u2f_hid_stop(U2fHid* u2f_hid);
+
+#ifdef __cplusplus
+}
+#endif