Embed assets in elf file (#2466)

* FBT: file_assets generator
* Elf file: process manifest section externally
* FBT, file_assets generator: add assets signature
* Storage: assets path alias
* Flipper application: assets unpacker
* Apps, Storage: use '/data' alias for apps data
* Storage: copy file to file
* Assets: log flag, fixes
* Update f18 api
* Assets: asserts
* Assets: fix signature_data check
* App assets: example
* Example assets: fix folder structure in readme
* Assets: fix error handling
* Assets builder: use ansii instead of utf-8, use .fapassets section instead of .fapfiles, add assets path to signature
* Elf file: comment strange places
* Storage: totaly optimized storage_file_copy_to_file

applications/services/storage/storage_external_api.c

@@ -9,6 +9,7 @@
 
 #define MAX_NAME_LENGTH 256
 #define MAX_EXT_LEN 16
+#define FILE_BUFFER_SIZE 512
 
 #define TAG "StorageAPI"
 
@@ -251,6 +252,26 @@ bool storage_file_exists(Storage* storage, const char* path) {
     return exist;
 }
 
+bool storage_file_copy_to_file(File* source, File* destination, uint32_t size) {
+    uint8_t* buffer = malloc(FILE_BUFFER_SIZE);
+
+    while(size) {
+        uint32_t read_size = size > FILE_BUFFER_SIZE ? FILE_BUFFER_SIZE : size;
+        if(storage_file_read(source, buffer, read_size) != read_size) {
+            break;
+        }
+
+        if(storage_file_write(destination, buffer, read_size) != read_size) {
+            break;
+        }
+
+        size -= read_size;
+    }
+
+    free(buffer);
+    return size == 0;
+}
+
 /****************** DIR ******************/
 
 static bool storage_dir_open_internal(File* file, const char* path) {