ExchangeMarket

• Added return to aliases.
• Added option to show orderer each transaction they've confirmed.
• Added comments to config file.
• Upon startup we check the disk config for missing properties, then give a warning if something's missing.
• Fixed typo telling users to create a sellorder when they're trying to buy something.
• Remove price input from buy/sell command, adding it will give the command info message.
• Increasing amount of previous order will use person's last order instead of first found.
• Returning items will select the highest price sell orders first.
• Msgs to users in console shouldn't have the colour code in the prefix.
• Fixed events being registered twice.

* Single threaded, may lag server.
* Will default to sqlite on first run, servers running pre v1.1.0 need to set db-type to "mysql" in the config.