[FL-1696, FL-1685] IRDA: Add RC5, decoder refactoring (#663)

* [FL-1696] IRDA: Split decoders and protocols
* IRDA: Restruct directories.
* IRDA: fix long timings
* [FL-1685] IRDA: Add RC5

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

lib/irda/encoder_decoder/rc6/irda_rc6_spec.c

@@ -0,0 +1,18 @@
+#include "../irda_i.h"
+#include "irda_protocol_defs_i.h"
+
+static const IrdaProtocolSpecification irda_rc6_protocol_specification = {
+      .name = "RC6",
+      .address_length = 2,
+      .command_length = 2,
+      .frequency = IRDA_RC6_CARRIER_FREQUENCY,
+      .duty_cycle = IRDA_RC6_DUTY_CYCLE,
+};
+
+const IrdaProtocolSpecification* irda_rc6_get_spec(IrdaProtocol protocol) {
+    if (protocol == IrdaProtocolRC6)
+        return &irda_rc6_protocol_specification;
+    else
+        return NULL;
+}
+