Added NAWS negotiation to telnet protocol, for negotiating the client width/height. Use session.get_client_size() to get a tuple of (width, height) for the current output window. Not currently supported by the webclient. Also added options settings.CLIENT_DEFAULT_WIDTH and -HEIGHT for having a fallback. Note that none of Evennia's default systems currently use this width information.

src/settings_default.py

@@ -379,6 +379,11 @@ PERMISSION_HIERARCHY = ["Guests", # note-only used if GUEST_ENABLED=True
                         "Immortals"]
 # The default permission given to all new players
 PERMISSION_PLAYER_DEFAULT = "Players"
+# Default sizes for client window (in number of characters), if client
+# is not supplying this on its own
+CLIENT_DEFAULT_WIDTH = 78
+CLIENT_DEFAULT_HEIGHT = 45 # telnet standard is 24 but does anyone use such
+                           # low-res displays anymore?
 
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 # Guest accounts