[FL-2279] IR doxygen, rename irda -> infrared (#1010)

* IR: Doxygen docs, some rename
* Rename irda -> infrared
* Rollback collateral renames

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

lib/infrared/encoder_decoder/rc6/infrared_rc6_spec.c

@@ -0,0 +1,17 @@
+#include "../infrared_i.h"
+#include "infrared_protocol_defs_i.h"
+
+static const InfraredProtocolSpecification infrared_rc6_protocol_specification = {
+    .name = "RC6",
+    .address_length = 8,
+    .command_length = 8,
+    .frequency = INFRARED_RC6_CARRIER_FREQUENCY,
+    .duty_cycle = INFRARED_RC6_DUTY_CYCLE,
+};
+
+const InfraredProtocolSpecification* infrared_rc6_get_spec(InfraredProtocol protocol) {
+    if(protocol == InfraredProtocolRC6)
+        return &infrared_rc6_protocol_specification;
+    else
+        return NULL;
+}