various changes, stopwatch

Semaphore: Some bugfixes, some constructors added
Stopwatch: First implementation, can measure in ms(double) and
ms(normal)

timemanager/Stopwatch.h

@@ -0,0 +1,52 @@
+/**
+ * @file Stopwatch.h
+ *
+ * @date 08.04.2020
+ */
+
+#ifndef FRAMEWORK_TIMEMANAGER_STOPWATCH_H_
+#define FRAMEWORK_TIMEMANAGER_STOPWATCH_H_
+#include <framework/timemanager/Clock.h>
+
+class Stopwatch {
+    enum class DisplayMode {
+        MS_FLOAT,
+        MS
+    };
+
+    Stopwatch(bool displayOnDestruction = true, DisplayMode displayMode =
+            DisplayMode::MS_FLOAT);
+    virtual~ Stopwatch();
+
+    void start();
+
+    ms_normal_t stop();
+    ms_double_t stopPrecise();
+
+    void display();
+private:
+    static const ms_normal_t INVALID_TIME = 0xFFFFFFFF;
+
+    timeval startTime {0, 0};
+    timeval stopTime {0, 0};
+    timeval elapsedTime {0, 0};
+    double elapsedTimeMs = 0;
+    //ms_normal_t elapsedTimeMs {0};
+
+    bool displayOnDestruction = true;
+
+    enum class StopwatchState {
+        IDLE,
+        STARTED,
+    };
+
+    StopwatchState stopwatchState = StopwatchState::IDLE;
+    DisplayMode displayMode = DisplayMode::MS_FLOAT;
+
+    void stopInternal();
+};
+
+
+
+
+#endif /* FRAMEWORK_TIMEMANAGER_STOPWATCH_H_ */