[FL-3051] Gauge initialization routine refactoring, new DataMemory layout, configuration update (#2887)

* FuriHal: refactor power gauge config

* Format sources and move gauge DM load to separate method

* FuriHal: bq27220 refactoring part 1

* Power: use SYSDWN battery status flag for system shutdown

* Libs: bq27220 read DM before write, fix incorrect shift

* FuriHal: cleanup gauge config, add flags, add ptr DM type, update symbols

* FuriHal: 2 stage gauge DM verification and update, better detection routine

* FuriHal: update gauge configuration, lower sleep current and deadband

* FuriHal: gauge and charger health reporting

* Lib: cleanup bq27220 sources

* FuriHal: correct documentation for furi_hal_power_is_shutdown_requested

* FuriHal: proper gauge config for f7

applications/services/power/power_service/power.c

@@ -117,6 +117,7 @@ static bool power_update_info(Power* power) {
 
     info.is_charging = furi_hal_power_is_charging();
     info.gauge_is_ok = furi_hal_power_gauge_is_ok();
+    info.is_shutdown_requested = furi_hal_power_is_shutdown_requested();
     info.charge = furi_hal_power_get_pct();
     info.health = furi_hal_power_get_bat_health_pct();
     info.capacity_remaining = furi_hal_power_get_battery_remaining_capacity();
@@ -145,7 +146,7 @@ static void power_check_low_battery(Power* power) {
     }
 
     // Check battery charge and vbus voltage
-    if((power->info.charge == 0) && (power->info.voltage_vbus < 4.0f) &&
+    if((power->info.is_shutdown_requested) && (power->info.voltage_vbus < 4.0f) &&
        power->show_low_bat_level_message) {
         if(!power->battery_low) {
             view_dispatcher_send_to_front(power->view_dispatcher);

applications/services/power/power_service/power.h

@@ -37,6 +37,7 @@ typedef struct {
 typedef struct {
     bool gauge_is_ok;
     bool is_charging;
+    bool is_shutdown_requested;
 
     float current_charger;
     float current_gauge;