IR transmit example (#180)

* DWT-based microsecond delay

* simple ir app (work only with NEC protocol and predefined address - command)

* remove space from file name, add delay_us_init_DWT header

* float-based delay us

* init tim2 by CubeMX

* fix simple pwm functions

* simple pwm timer based ir nec protocol

* ir gui test app

Co-authored-by: aanper <mail@s3f.ru>

applications/irda/irda_nec.h

@@ -0,0 +1,4 @@
+#pragma once
+#include "flipper.h"
+
+void ir_nec_send(uint8_t addr, uint8_t data);