Move Makefile.am config vars into an include file "config.mk"
module-setup.lua: Try to load from subdirs in uninstalled mode

A subsequent directory reorganization will result in lua files moving
around in the source tree, and this will adapt to that.
Move libsnoglight.a into a new subdirectory "light"
Move libsnogtex.a into a new subdirectory "texture"
Move libsnogmat.a into a new subdirectory "material"
Move libsnogsurf.a into a new subdirectory "surface"
Move libsnoggeom.a into a new subdirectory "geometry"
Move libsnogimage.a into a new subdirectory "image"
Move libsnogspace.a into a new subdirectory "space"
Move libsnogcolor.a into a new subdirectory "color"
Move libsnogimagecli.a into a new subdirectory "imagecli"
Move libsnogisec.a into a new subdirectory "intersect"
Move libsnogcli.a into a new subdirectory "cli"
Move libsnogscenecli.a into a new subdirectory "scenecli"
Move libsnogphoton.a into a new subdirectory "photon"
Move libsnogscene.a into a new subdirectory "scene"
Move libsnogrender.a into a new subdirectory "render"
Rename libsnogrdrive.a to "libsnogrendermgr.a"

"rdrive" is a pretty bad name, hopefully "render-mgr" is more
understandable.
Move libsnogrendermgr.a into a new subdirectory "render-mgr"
Move libsnogutil.a into a new subdirectory "util"