Schem fixes and updates (ldtteam#6716)

updates asian big walls (from thaylar)
adds new stone lion statue variant (from thaylar)
removed petrified oak slabs from caledonia florist (from thaylar)
fixes racks in caledonia warehouse (from thaylar)
readds fortress corner inside deco (from thaylar)
adds fortress alternative warehouse (double size) (from draxx)
adds fortress rails (from draxx)
updates fortress intersection and tjunction level 3 (replaces pergolas with the ones from the new rails) (from draxx)
adds alternate jungle supply camp (from johnreiher)