* Added the 'imclist' command to show other games connected to IMC.

* Added the automatic cleaning/pruning code to weed out entries that are probably disconnected.
* Added 'imcwhois <player>' command. Still needs some sanitizing on the outgoing string.
* Added the beginnings of a -reply packet handler through reply_listener.py.
* Fleshed out a few more packets in packets.py.
Next up: Make the ANSI system a little more modular. Create a class for ANSI tables so developers can pick and choose different tables on their own, but keep the same API. This will be used so we don't have to copy/paste src/ansi.py to src/imc2/ansi.py and duplicate stuff.

src/imc2/trackers.py

@@ -0,0 +1,44 @@
+"""
+Certain periodic packets are sent by connected MUDs (is-alive, user-cache,
+etc). The IMC2 protocol assumes that each connected MUD will capture these and
+populate/maintain their own lists of other servers connected. This module
+contains stuff like this. 
+"""
+from time import time
+
+class IMC2Mud(object):
+    """
+    Stores information about other games connected to our current IMC2 network.
+    """
+    def __init__(self, packet):
+        self.name = packet.origin
+        self.versionid = packet.optional_data.get('versionid', None)
+        self.networkname = packet.optional_data.get('networkname', None)
+        self.url = packet.optional_data.get('url', None)
+        self.host = packet.optional_data.get('host', None)
+        self.port = packet.optional_data.get('port', None)
+        self.sha256 = packet.optional_data.get('sha256', None)
+        # This is used to determine when a Mud has fallen into inactive status.
+        self.last_updated = time()
+        
+class IMC2MudList(object):
+    """
+    Keeps track of other MUDs connected to the IMC network.
+    """
+    def __init__(self):
+        # Mud list is stored in a dict, key being the IMC Mud name.
+        self.mud_list = {}
+        
+    def update_mud_from_packet(self, packet):
+        # This grabs relevant info from the packet and stuffs it in the
+        # Mud list for later retrieval.
+        mud = IMC2Mud(packet)
+        self.mud_list[mud.name] = mud
+        
+    def remove_mud_from_packet(self, packet):
+        # Removes a mud from the Mud list when given a packet.
+        mud = IMC2Mud(packet)
+        del self.mud_list[mud.name]
+
+# Use this instance to keep track of the other games on the network.
+IMC2_MUDLIST = IMC2MudList()