Readd scheduled fights

src/004-base/basePitFight.js

src/events/scheduled/pitFight.js

src/facilities/pit/fights/0_lethalRandom.js

src/facilities/pit/fights/0_nonLethalRandom.js

src/facilities/pit/fights/2_lethalScheduledBG.js

src/facilities/pit/pit.js

src/facilities/pit/pitFightList.js

src/npc/interaction/killSlave.js