vastspace: Separated SpacePlane-draw.cpp from SpacePlane.cpp

Also switched model source from obsolete compiled .bin files to the
original .mqo files.
vastspace: Move ContainerHead models and textures to mods directory
vastspace: Make ContainerHead models refer textures by relative path

The textures are shared with main executable, so we can refer to them
by a relative path.
vastspace: Separated ContainerHead-draw.cpp from ContainerHead.cpp

Also switched model source from obsolete compiled .bin files to the
original .mqo files, just like SpacePlane.
vastspace: Deleted rough LOD model of hexcontainer.mqo

It saves a tiny number of polycount, but it affects the performance
very little since vertex buffer objects (VBOs) are introduced.
In addition, it requires distance measurement and determination of
model, which requires CPU load (not GPU computed) and does not
parallelize well.
vastspace: Add initialization script to ContainerHead

Also converted fixed size arrays of containers and engine positions to
std::vectors in order to support variable size customization by the
initialization script.
vastspace: Add initialization script to SpacePlane

Also replaced redundant axis rotation matrix with negative scaling
in SpacePlane::draw().
vastspace: Corrected calculation of the hit radius for ContainerHead

ContainerHead has a variable geometry which have made it difficult
to compute hit radius for each instance.  Now we provided a very
basic way to expect the radius.