Add a configure command for initial wad setup. Reshuffle a couple things that depend on it.

dcc/config.py

@@ -57,11 +57,3 @@ class Base(Command):
     @property
     def dsda(self):
         return self._doom.joinpath(self._dsda)
-
-    def iwad_path(self, wad):
-        iwad = self.iwads.joinpath(self._config.get("default_iwad"))
-        iwadpath = self.pwads.joinpath(wad).joinpath("iwad")
-        if iwadpath.exists():
-            with io.open(iwadpath) as f:
-                iwad = self.iwads.joinpath(f.read().strip() + ".WAD")
-        return iwad