SubGhz: sending / receiving messages via subghz (#851)

* SubGhz: add worker subghz_txrx
* SubGhz: added support for transferring Russian characters and support for backspace in CLI subghz_txrx
* SubGhz: refactoring subghz_txrx_worker, added a callback for accepting data in an empty one RX buffer
* SubGhz: fix conflict
* SubGhz: fix syntax errors
* Cli: document string_move usage and its behavior
* FuriHal: update subghz api and documentation. Subghz: move chat to subghz cli subcommand.
* Subghz: update text in chat cli

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

lib/subghz/subghz_tx_rx_worker.h

@@ -0,0 +1,81 @@
+#pragma once
+
+#include <furi-hal.h>
+
+typedef void (*SubGhzTxRxWorkerCallbackHaveRead)(void* context);
+
+typedef struct SubGhzTxRxWorker SubGhzTxRxWorker;
+
+typedef enum {
+    SubGhzTxRxWorkerStatusIDLE,
+    SubGhzTxRxWorkerStatusTx,
+    SubGhzTxRxWorkerStatusRx,
+} SubGhzTxRxWorkerStatus;
+
+/** SubGhzTxRxWorker, add data to transfer
+ * 
+ * @param instance  SubGhzTxRxWorker instance
+ * @param data      *data
+ * @param size      data size
+ * @return bool     true if ok
+ */
+bool subghz_tx_rx_worker_write(SubGhzTxRxWorker* instance, uint8_t* data, size_t size);
+
+/** SubGhzTxRxWorker, get available data
+ * 
+ * @param instance   SubGhzTxRxWorker instance
+ * @return size_t    data size
+ */
+size_t subghz_tx_rx_worker_available(SubGhzTxRxWorker* instance);
+
+/** SubGhzTxRxWorker, read data
+ * 
+ * @param instance   SubGhzTxRxWorker instance
+ * @param data       *data
+ * @param size       max data size, which can be read
+ * @return size_t    data size, how much is actually read
+ */
+size_t subghz_tx_rx_worker_read(SubGhzTxRxWorker* instance, uint8_t* data, size_t size);
+
+/** Сallback SubGhzTxRxWorker when there is data to read in an empty buffer
+ * 
+ * @param instance SubGhzTxRxWorker instance
+ * @param callback SubGhzTxRxWorkerCallbackHaveRead callback
+ * @param context
+ */
+void subghz_tx_rx_worker_set_callback_have_read(
+    SubGhzTxRxWorker* instance,
+    SubGhzTxRxWorkerCallbackHaveRead callback,
+    void* context);
+
+/** Allocate SubGhzTxRxWorker
+ * 
+ * @return SubGhzTxRxWorker* 
+ */
+SubGhzTxRxWorker* subghz_tx_rx_worker_alloc();
+
+/** Free SubGhzTxRxWorker
+ * 
+ * @param instance SubGhzTxRxWorker instance
+ */
+void subghz_tx_rx_worker_free(SubGhzTxRxWorker* instance);
+
+/** Start SubGhzTxRxWorker
+ * 
+ * @param instance SubGhzTxRxWorker instance
+ * @return bool - true if ok
+ */
+bool subghz_tx_rx_worker_start(SubGhzTxRxWorker* instance, uint32_t frequency);
+
+/** Stop SubGhzTxRxWorker
+ * 
+ * @param instance SubGhzTxRxWorker instance
+ */
+void subghz_tx_rx_worker_stop(SubGhzTxRxWorker* instance);
+
+/** Check if worker is running
+ * 
+ * @param instance SubGhzTxRxWorker instance
+ * @return bool - true if running
+ */
+bool subghz_tx_rx_worker_is_running(SubGhzTxRxWorker* instance);