[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.

bootloader/targets/include/target.h

@@ -1,25 +1,25 @@
 #ifndef TARGET_H
 #define TARGET_H
 
-/*
+/**
  * Initialize hardware
 */
 void target_init();
 
-/*
+/**
  * Check if dfu mode requested
  * @return 1 if dfu mode requested, 0 if not
-*/
+ */
 int target_is_dfu_requested();
 
-/*
+/**
  * Switch to dfu mode
-*/
+ */
 void target_switch2dfu();
 
-/*
+/**
  * Switch to OS
-*/
+ */
 void target_switch2os();
 
 #endif