[FL-2589] RPC App control commands (#1350)

* RPC App control commands
* Button release timeout
* SubGhz tx fix

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

applications/nfc/nfc_i.h

@@ -29,10 +29,18 @@
 #include <nfc/scenes/nfc_scene.h>
 #include <nfc/helpers/nfc_custom_event.h>
 
+#include "rpc/rpc_app.h"
+
 #define NFC_SEND_NOTIFICATION_FALSE (0UL)
 #define NFC_SEND_NOTIFICATION_TRUE (1UL)
 #define NFC_TEXT_STORE_SIZE 128
 
+typedef enum {
+    NfcRpcStateIdle,
+    NfcRpcStateEmulating,
+    NfcRpcStateEmulated,
+} NfcRpcState;
+
 // Forward declaration due to circular dependency
 typedef struct NfcGenerator NfcGenerator;
 
@@ -48,6 +56,9 @@ struct Nfc {
     char text_store[NFC_TEXT_STORE_SIZE + 1];
     string_t text_box_store;
 
+    void* rpc_ctx;
+    NfcRpcState rpc_state;
+
     // Common Views
     Submenu* submenu;
     DialogEx* dialog_ex;
@@ -85,3 +96,5 @@ void nfc_text_store_clear(Nfc* nfc);
 void nfc_blink_start(Nfc* nfc);
 
 void nfc_blink_stop(Nfc* nfc);
+
+void nfc_rpc_exit_callback(Nfc* nfc);