Major refactor to make handling name/path manipulation easier.

Most of this is now in doom_base.py, which stores wad/map/name, exposes them as
properties, and also takes care of most common tasks needed for building
command lines and such.

dcc/pb.py

@@ -4,4 +4,4 @@ import subprocess
 
 class PB(dcc.doom_base.WadMap):
 	def take_action(self, parsed_args):
-		subprocess.run(["ffplay", dcc.config.VideoPath(parsed_args.wad, parsed_args.map, parsed_args.name)])
+		subprocess.run(["ffplay", self.video_path()])