Using constants defined in OpenDaVINCI

[HangYin2015]

OpenDaVINCI contains a generated file automotivedata/generated/cartesian/Constants.h which defines a lot of common constants such as PI and DEG2RAD (degree to radian). In the OpenDaVINCI layer, programs can include this header to refer to these constants. However, it is not clear how to make use of these constants in opendlv.core or higher layers, because the compiler will complain if a program in opendlv.core refers to a constant and includes this header.