Added monopoly dev card
Added dev cards to help.rkt
Improved rlock error message from server
Added knight
Added monopoly
Fixed server initialization message
Made usernames bold
Added turn option for show
Added year-of-plenty
Added road-building
Fixed road-building bug

Now, you build the roads in order, so the second road can branch off from the
first.
Reworked help.rkt, added new dev-card commands
Implemeneted victory points
Added veep dev card

Now, all dev cards are implemented
Fixed city; you can only build it on a settlement

Also fixed endgame conditions. Game over message is now sent, need to send a
"terminate" message to clients now.
Implemented proper endgame handling

Now, a game over message is displayed, and the clients and server both exit
gracefully.
Better error messages for placing buildings/roads
Added item costs to help.rkt

Also moved the stock utility functions from engine.rkt to adv.rkt
Made the users start with standard inventory/veeps
Fixed minor server output bug