IR RX simple app (#218)

* split falling and rising ir rx events
* fix irda
* simple irda rx function for app
* add extern timer
* fix timer num for f2

firmware/targets/f3/api-hal/api-hal-tim.h

@@ -0,0 +1,4 @@
+#pragma once
+#include "main.h"
+
+void tim_irda_rx_init(void);