Add sampleSGP4Orbit function to tools.cpp
Add sampleSGP4Orbit function to tools.cpp

This feature will compute and store sgp4 propagated state.

ennehekma/d2d,agrawalabhishek/d2d,kartikkumar/d2d,ennehekma/d2d,ennehekma/d2d,kartikkumar/d2d,agrawalabhishek/d2d,kartikkumar/d2d,agrawalabhishek/d2d,openastro/d2d,openastro/d2d,openastro/d2d