Add a way of retrieving channel and user names from renderer state object

src/renderer/scr.savefile.js

@@ -20,13 +20,21 @@ SAVEFILE.prototype.getServer = function(index){
 };
 
 SAVEFILE.prototype.getChannels = function(){
-  return this.meta.channels || {};
+  return this.meta.channels;
+};
+
+SAVEFILE.prototype.getChannelById = function(channel){
+  return this.meta.channels[channel] || { id: channel, name: channel };
 };
 
 SAVEFILE.prototype.getUser = function(index){
   return this.meta.users[this.meta.userindex[index]] || { name: "<unknown>" };
 };
 
+SAVEFILE.prototype.getUserById = function(user){
+  return this.meta.users[user] || { name: user };
+};
+
 SAVEFILE.prototype.getMessageCount = function(channel){
   return Object.keys(this.data[channel]).length || 0;
 };

src/renderer/src.state.js

@@ -21,6 +21,14 @@ var STATE = (function(){
       }));
     },
     
+    getChannelName: function(channel){
+      return FILE.getChannelById(channel).name;
+    },
+    
+    getUserName: function(user){
+      return FILE.getUserById(user).name;
+    },
+    
     selectChannel: function(channel){
       selectedChannel = channel;
       MSGS = Object.keys(FILE.getMessages(channel)).sort();