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_i.h

@@ -13,6 +13,7 @@ extern "C" {
 #define STORAGE_COUNT (ST_INT + 1)
 
 #define APPS_DATA_PATH EXT_PATH("apps_data")
+#define APPS_ASSETS_PATH EXT_PATH("apps_assets")
 
 typedef struct {
     ViewPort* view_port;