Various changes prior to using github

Rename SteamBot.sln to SteamIdleBot.sln
Remove AdminUserHandler and SimpleUserHandler
Add ReceivingUserHandler, GivingUserHandler, and MainUserHandler
Change Log.cs to place logs in their own folder "Logs"
Change Bot.cs to place sentry files in their own folder "Sentry Files"
In Bot.cs:
Change ulong[] Admins into a ulong List
Add int numBots, the total number of running bots
Fix typo
Call OnTradeError when trade start fails (untested)
In BotManager.cs
Change log to exclude bots with AutoStart set to 'false'
In Configuration.cs
Added number of bots to BotInfo
Changed Admin ulong[] into list
In UserHandler.cs
Added many static variables for bot communication