commit rest of old client/server fixes

constants.py

@@ -0,0 +1,10 @@
+class Requests:
+    REQUEST_NICK = 'REQUEST_NICK'
+    REFRESH_CONNECTIONS_LIST = 'REFRESH_CLIENT_LIST'
+    GET_HISTORY = 'GET_HISTORY'
+
+class Types:
+    REQUEST = 'REQUEST'
+    NICKNAME = 'NICKNAME'
+    USER_LIST = 'USER_LIST'
+    MESSAGE = 'MESSAGE'