Various Fixes for 0.95 (#3215)

* FuriHal: retry gauge/charger initialization
* FuriHal: lower logging level for flash known errata
* FuriHal: graceful fail if subghz chip is not working
* Furi: issue stop command even if timer is not active, document timer behavior

furi/core/timer.h

@@ -32,6 +32,9 @@ FuriTimer* furi_timer_alloc(FuriTimerCallback func, FuriTimerType type, void* co
 void furi_timer_free(FuriTimer* instance);
 
 /** Start timer
+ *
+ * @warning    This is asynchronous call, real operation will happen as soon as
+ *             timer service process this request.
  *
  * @param      instance  The pointer to FuriTimer instance
  * @param[in]  ticks     The interval in ticks
@@ -41,6 +44,9 @@ void furi_timer_free(FuriTimer* instance);
 FuriStatus furi_timer_start(FuriTimer* instance, uint32_t ticks);
 
 /** Restart timer with previous timeout value
+ *
+ * @warning    This is asynchronous call, real operation will happen as soon as
+ *             timer service process this request.
  *
  * @param      instance  The pointer to FuriTimer instance
  * @param[in]  ticks     The interval in ticks
@@ -50,6 +56,9 @@ FuriStatus furi_timer_start(FuriTimer* instance, uint32_t ticks);
 FuriStatus furi_timer_restart(FuriTimer* instance, uint32_t ticks);
 
 /** Stop timer
+ *
+ * @warning    This is asynchronous call, real operation will happen as soon as
+ *             timer service process this request.
  *
  * @param      instance  The pointer to FuriTimer instance
  *
@@ -58,6 +67,10 @@ FuriStatus furi_timer_restart(FuriTimer* instance, uint32_t ticks);
 FuriStatus furi_timer_stop(FuriTimer* instance);
 
 /** Is timer running
+ *
+ * @warning    This cal may and will return obsolete timer state if timer
+ *             commands are still in the queue. Please read FreeRTOS timer
+ *             documentation first.
  *
  * @param      instance  The pointer to FuriTimer instance
  *