name w/o path: assume textures are in the folder, where model file is
absolute path or with ..: try to cut at "/models/" or "/textures/" (as if leading to game folders); do previous case, if not
strip extensions and turn slashes to forward ones anytime
* picomodel::obj: fix diffuse map paths loading from .mtl
* fix crash with nonpthreads xmllib + multithreading + output to system console
* number of code fixes
Radiant:
misc...
* fix: clone group ent / map import / saving map as : group ents name labels at 0,0,0;
* number of code fixes
