Ongoing fixes for the arched tunnel.
Moved the files to match the Android project structure.
Adding the remaing items from the Android project.
Adding the initiall mesh support-
DrawDisk() made into a proper mesh object, DiskMesh.
Belongs to the previous DrawDisk refactoring.
Adding the mesh files to the build.
Making proper use of nullptr.
Making use of the BoxMesh, introduced on the previous commit.
Now the header uses OpenGL types everywhere.
Fixed the error with the tunnel drawing of the outside walls.
Added a C++11 override specifier.
Fixed a model error introduced during refactoring.
Some more refactoring