[FL-1931, FL-2005] SubGhz: migration in flipper file format (#807)

* SubGhz: add save key in flipper file format
* [FL-2005] SubGhz: fix stored signals cannot be deleted
* SubGhz: add load key in flipper file format
* SubGhz: fix syntax
* SubGhz: fix bad file upload
* Storage: add function to get the next free filename
* SubGhz: add save RAW  in flipper file format
* SubGhz: add load RAW in flipper file format
* SubGhz: refactoring protocol
* SubGhz: refactoring scene
* SubGhz: fix SubGhzNotificationState define
* Makefile: proper comapre for FORCE

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

applications/storage/storage-external-api.c

@@ -463,3 +463,28 @@ bool storage_simply_mkdir(Storage* storage, const char* path) {
     result = storage_common_mkdir(storage, path);
     return result == FSE_OK || result == FSE_EXIST;
 }
+
+void storage_get_next_filename(
+    Storage* storage,
+    const char* dirname,
+    const char* filename,
+    const char* fileextension,
+    string_t nextfilename) {
+    string_t temp_str;
+    uint16_t num = 0;
+
+    string_init_printf(temp_str, "%s/%s%s", dirname, filename, fileextension);
+
+    while(storage_common_stat(storage, string_get_cstr(temp_str), NULL) == FSE_OK) {
+        num++;
+        string_printf(temp_str, "%s/%s%d%s", dirname, filename, num, fileextension);
+    }
+
+    if(num) {
+        string_printf(nextfilename, "%s%d", filename, num);
+    } else {
+        string_printf(nextfilename, "%s", filename);
+    }
+
+    string_clear(temp_str);
+}

applications/storage/storage.h

@@ -262,6 +262,22 @@ bool storage_simply_remove_recursive(Storage* storage, const char* path);
  */
 bool storage_simply_mkdir(Storage* storage, const char* path);
 
+/**
+ * @brief Get next free filename.
+ * 
+ * @param storage
+ * @param dirname 
+ * @param filename 
+ * @param fileextension 
+ * @param nextfilename return name
+ */
+void storage_get_next_filename(
+    Storage* storage,
+    const char* dirname,
+    const char* filename,
+    const char* fileextension,
+    string_t nextfilename);
+
 #ifdef __cplusplus
 }
 #endif