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

dcc/configure.py

@@ -0,0 +1,24 @@
+import dcc.config
+import tomlkit
+from tomlkit.toml_file import TOMLFile
+
+class Configure(dcc.config.Base):
+    def get_parser(self, prog_name):
+        parser = super().get_parser(prog_name)
+        parser.add_argument("wad")
+        parser.add_argument("complevel")
+        parser.add_argument("--iwad")
+        return parser
+
+    def take_action(self, parsed_args):
+        new_config = self.pwads.joinpath(parsed_args.wad).joinpath(self.config_name)
+        if new_config.exists():
+            raise Exception("Config %s already exists.".format(new_config))
+
+        doc = tomlkit.document()
+        doc.add("complevel", parsed_args.complevel)
+        if parsed_args.iwad is not None:
+            doc.add("iwad", parsed_args.iwad)
+
+        f = TOMLFile(new_config)
+        f.write(doc)