GraveDoom v1.0.1

Thanks to some great feedback from doomworld forums (LadyMiustDragon, S3M_XM, Zahid) I have fixed some issues, particularly when using COMPLEVEL 3:

e1m2 Fixed HOM on both hidden stairs

e1m2 Fixed one way door to left of entrance

e1m2 Added second lift out of nukage

e1m4 Remove linedef action on red key tower that traps the player

e1m4 Set Imp (thing 67) to ambush

e1m7 Fix floor raise after collecting blue key

e1m7 Added rocket launcher and chaingun

e1m7 Added lift out of nukage

e1m9 Fixed one way red key door