minor cleanup of btgui/demo3 stuff, much more demo cleanup is needed

moved some files in btgui/Bullet3AppSupport

btgui/Bullet3AppSupport/b3Clock.h

@@ -0,0 +1,31 @@
+#ifndef B3_CLOCK_H
+#define B3_CLOCK_H
+
+
+///The b3Clock is a portable basic clock that measures accurate time in seconds, use for profiling.
+class b3Clock
+{
+public:
+	b3Clock();
+
+	b3Clock(const b3Clock& other);
+	b3Clock& operator=(const b3Clock& other);
+
+	~b3Clock();
+
+	/// Resets the initial reference time.
+	void reset();
+
+	/// Returns the time in ms since the last call to reset or since 
+	/// the b3Clock was created.
+	unsigned long int getTimeMilliseconds();
+
+	/// Returns the time in us since the last call to reset or since 
+	/// the Clock was created.
+	unsigned long int getTimeMicroseconds();
+private:
+	struct b3ClockData* m_data;
+};
+
+
+#endif //B3_CLOCK_H