[FL-835] Factory reset. Cli refactoring. (#466)

* ApiHal: add boot flags. Internal storage: add factory reset.
* Bootloader: correct doxygen comment format.
* Cli: change cli callback signature. Applications: update API usage. Add factory_reset cli command.

applications/cli/cli.h

@@ -16,7 +16,7 @@ typedef struct Cli Cli;
  * @param args - string with what was passed after command
  * @param context - pointer to whatever you gave us on cli_add_command
  */
-typedef void (*CliCallback)(string_t args, void* context);
+typedef void (*CliCallback)(Cli* cli, string_t args, void* context);
 
 /* Add cli command
  * Registers you command callback