Replace app_timer with FreeRTOS timers

src/components/timer/TimerController.h

@@ -1,37 +1,33 @@
 #pragma once
 
-#include <cstdint>
-#include "app_timer.h"
-#include "portmacro_cmsis.h"
+#include <FreeRTOS.h>
+#include <timers.h>
 
 namespace Pinetime {
   namespace System {
     class SystemTask;
   }
   namespace Controllers {
-    
+
     class TimerController {
     public:
       TimerController() = default;
-      
-      void Init();
-      
+
+      void Init(System::SystemTask* systemTask);
+
       void StartTimer(uint32_t duration);
-      
+
       void StopTimer();
-      
+
       uint32_t GetTimeRemaining();
-      
+
       bool IsRunning();
 
       void OnTimerEnd();
 
-      void Register(System::SystemTask* systemTask);
-
     private:
       System::SystemTask* systemTask = nullptr;
-      TickType_t endTicks;
-      bool timerRunning = false;
+      TimerHandle_t timer;
     };
   }
-}
+}