[FL-2430] Automatic Desktop Locking (#1101)

* Add Auto Lock Time setting
* Update .gitignore
* Add value_index toolbox module
* Auto locking basic implementation
* Better AutoLock implementation, edge cases and cleanup
* Fix NULL pointer crash
* Turn off backlight shortly in locked mode
* Re-enable auto lock after pin lock
* Correctly handle start when pin locked
* Use timer to hide locked hint
* Use a single state variable instead of multiple bools
* Do not call update callback recursively
* Allow input when the Unlocked hint is shown
* Add a delay to backlight switch off while locking
* Better user input handling
* Switch backlight off after pin timeout
* Correct grammar in notification settings

Co-authored-by: あく <alleteam@gmail.com>

applications/desktop/desktop_settings/desktop_settings.h

@@ -5,7 +5,7 @@
 #include <stdbool.h>
 #include <toolbox/saved_struct.h>
 
-#define DESKTOP_SETTINGS_VER (1)
+#define DESKTOP_SETTINGS_VER (2)
 #define DESKTOP_SETTINGS_PATH "/int/desktop.settings"
 #define DESKTOP_SETTINGS_MAGIC (0x17)
 #define PIN_MAX_LENGTH 12
@@ -39,6 +39,7 @@ typedef struct {
 typedef struct {
     uint16_t favorite;
     PinCode pin_code;
+    uint32_t auto_lock_delay_ms;
 } DesktopSettings;
 
 static inline bool pins_are_equal(const PinCode* pin_code1, const PinCode* pin_code2) {