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

moved some files in btgui/Bullet3AppSupport

btgui/Bullet3AppSupport/CommonParameterInterface.h

@@ -0,0 +1,43 @@
+
+#ifndef PARAM_INTERFACE_H
+#define PARAM_INTERFACE_H
+
+#pragma once
+
+typedef void (*SliderParamChangedCallback) (float newVal);
+#include "LinearMath/btScalar.h"
+
+struct SliderParams
+{
+	const char* m_name;
+	float m_minVal;
+	float m_maxVal;
+	SliderParamChangedCallback m_callback;
+	btScalar* m_paramValuePointer;
+	void* m_userPointer;
+	bool m_clampToNotches;
+
+	SliderParams(const char* name, btScalar* targetValuePointer)
+	:m_name(name),
+	m_minVal(-100),
+	m_maxVal(100),
+	m_callback(0),
+	m_paramValuePointer(targetValuePointer),
+	m_userPointer(0),
+	m_clampToNotches(false)
+	{
+	}
+
+};
+
+
+struct CommonParameterInterface
+{
+	virtual void registerSliderFloatParameter(SliderParams& params)=0;
+	virtual void syncParameters()=0;
+	virtual void removeAllParameters()=0;
+    virtual void setSliderValue(int sliderIndex, double sliderValue)=0;
+
+};
+	
+#endif //PARAM_INTERFACE_H