store material slots in media.cfg
sync @ 945
make setshader/setshaderparam respect texgroups (changes only apply within the group); make texload always use stdshader before loading the pack, restore afterwards
const
prototypes
sound preload commands
progress bars!
mapmodel and sound preloading for media.cfg (optionally)
matload command for loading material packs; allow materialreset to reset only a certain material type; remove texture/material stuff from default_map_settings; media.cfg for emptymap; introduce material packs
cleanup
sync @ 955