[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.

firmware/targets/api-hal-include/api-hal-boot.h

@@ -11,9 +11,21 @@ typedef enum {
     ApiHalBootModeDFU
 } ApiHalBootMode;
 
+/** Boot flags */
+typedef enum {
+    ApiHalBootFlagDefault=0,
+    ApiHalBootFlagFactoryReset=1,
+} ApiHalBootFlag;
+
 /** Set boot mode */
 void api_hal_boot_set_mode(ApiHalBootMode mode);
 
+/** Set boot flags */
+void api_hal_boot_set_flags(ApiHalBootFlag flags);
+
+/** Get boot flag */
+ApiHalBootFlag api_hal_boot_get_flags();
+
 #ifdef __cplusplus
 }
 #endif