lego1: implement MxTimer + dependencies

LEGO1/mxtimer.h

@@ -1,10 +1,31 @@
 #ifndef MXTIMER_H
 #define MXTIMER_H
 
-class MxTimer
+#include "mxcore.h"
+
+class MxTimer : public MxCore
 {
 public:
+  MxTimer();
+
+  void Start();
+  void Stop();
+
   __declspec(dllexport) long GetRealTime();
+
+  long GetTime() inline
+  {
+    if (this->m_isRunning)
+      return s_LastTimeCalculated;
+    else
+      return s_LastTimeCalculated - this->m_startTime;
+  }
+
+private:
+  long m_startTime;
+  MxBool m_isRunning;
+  static long s_LastTimeCalculated;
+  static long s_LastTimeTimerStarted;
 };
 
 #endif // MXTIMER_H