Added Tank Model file to project. And two files seemed to be modified on build..
Merge branch 'tank-model' of https://github.com/Megabyte355/RollerCoasterOpenGL into tank-model
Merge branch 'tank-model' of https://github.com/Megabyte355/RollerCoasterOpenGL into tank-model
Merge branch 'tank-model' of https://github.com/Megabyte355/RollerCoasterOpenGL into tank-model

Completed the Tank integration into the world, have replaced the references to point to the Tank model instead of the Helicopters.

Signed-off-by: Alex <d3t0ur@hotmail.com>
merge from tank model.