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

lib/flipper_application/application_assets.h

@@ -0,0 +1,17 @@
+/**
+ * @file application_assets.h
+ * Flipper application assets
+ */
+#pragma once
+
+#include <storage/storage.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool flipper_application_assets_load(File* file, const char* elf_path, size_t offset, size_t size);
+
+#ifdef __cplusplus
+}
+#endif