Improved ray shape (2D and 3D) by addiing the possibility to act as regular shape

modules/bullet/btRayShape.cpp

@@ -54,6 +54,11 @@ void btRayShape::setLength(btScalar p_length) {
 	reload_cache();
 }
 
+void btRayShape::setSlipsOnSlope(bool p_slipsOnSlope) {
+
+	slipsOnSlope = p_slipsOnSlope;
+}
+
 btVector3 btRayShape::localGetSupportingVertex(const btVector3 &vec) const {
 	return localGetSupportingVertexWithoutMargin(vec) + (m_shapeAxis * m_collisionMargin);
 }