Fix for high CPU usage.

When bots are in separate process mode the bot had an empty loop to keep the console open and the process alive. This needed a sleep so it didn't peg CPU time.
Merge pull request #313 from cwhelchel/fix/highcpu

High CPU fix. Closes #290
Added Group chats, OnLoginCompleted() to handlers

A group chat can be joined by:

SteamFriends.JoinChat(SteamIDOfGroup);
Added summary to OnLoginCompleted()
Update SimpleUserHandler.cs

Adds some failsafes: A try-catch for AcceptTrade() and a Poll on OnTradeReady()
Merge pull request #317 from Jessecar96/groupchat

Adds group chat, OnLoginCompleted() to Userhandlers
Merge pull request #318 from Fiskie/master

SimpleUserHandler failsafes