Add local force & additional graphics compatability mode

Though yet untested, the following functions have been added(Ported from Delfi's code) and are expected to work:

GmnBodyGetPointGlobalVelocity(Body, x, y, z, axis);

GmnBodyGetPointLocalVelocity(Body, x, y, z, axis);

GmnBodyAddPointGlobalForce(Body, x,y,z, xforce,yforce,zforce);

GmnBodyAddPointLocalForce(Body, x,y,z, xforce,yforce,zforce);

GmnBodyGetLocalOmega(Body, axis);

Also, support is confirmed for an additional GM rendering engine.