Temporarily backport app updates from apps repo

applications/external/i2ctools/i2csender.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <furi.h>
+#include <furi_hal.h>
+#include "i2cscanner.h"
+
+typedef struct {
+    uint8_t address_idx;
+    uint8_t value;
+    uint8_t recv[2];
+    bool must_send;
+    bool sended;
+    bool error;
+
+    i2cScanner* scanner;
+} i2cSender;
+
+void i2c_send();
+
+i2cSender* i2c_sender_alloc();
+void i2c_sender_free(i2cSender* i2c_sender);