[MAP] [Vanilla] Redrum file

Another vanilla map by my authorship, made in a little less than a week. It's hard to say something about it separately, but I tried to balance between design and compactness, the difficulty is medium, approximate time of passing - about 15 minutes. Difficulty levels are implemented, but the most tested one is Ultra Violence, I tried not to gesture. Tested in Chocolate Render Limits, in Chocolate Doom, and in Woof, should work absolutely everywhere, since vanilla.