Don't yet make this official API though, since there are unresolved issues
with newly created tsprites potentially being fed back to the animation loop.
Add xmath.angvec(), xmath.bangvec(), tspr:set_sectnum(), tspr:setpos().
git-svn-id: https://svn.eduke32.com/eduke32@3937 1a8010ca-5511-0410-912e-c29ae57300e0
- swap 2d and 3rd args in xmath.rotate() -- now rotate(point, ang, pivot)
- add vec3 method 'rotate', calling xmath.rotate
- store game tic count in savegames
git-svn-id: https://svn.eduke32.com/eduke32@3929 1a8010ca-5511-0410-912e-c29ae57300e0
