[FL-2230] SubGhz: protocol API refactoring (#969)

* SubGhz: protocols library refactoring
* SubGhz: new architecture and refactoring
* SubGhz: simplify protocol structure, remove unused types
* SubGhz: rename Subghz to SubGhz
* SubGhz: add environment concept

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
Co-authored-by: DrZlo13 <who.just.the.doctor@gmail.com>

lib/subghz/transmitter.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "types.h"
+#include "environment.h"
+#include "protocols/base.h"
+
+typedef struct SubGhzTransmitter SubGhzTransmitter;
+
+struct SubGhzTransmitter {
+    const SubGhzProtocol* protocol;
+    SubGhzProtocolEncoderBase* protocol_instance;
+};
+
+SubGhzTransmitter*
+    subghz_transmitter_alloc_init(SubGhzEnvironment* environment, const char* protocol_name);
+
+void subghz_transmitter_free(SubGhzTransmitter* instance);
+
+bool subghz_transmitter_stop(SubGhzTransmitter* instance);
+
+bool subghz_transmitter_deserialize(SubGhzTransmitter* instance, FlipperFormat* flipper_format);
+
+LevelDuration subghz_transmitter_yield(void* context);