Added custom font

Added a custom font, at this moment it is just the standard Arial font.
Added username display box

This box gets the username and the main file simply prints the returned
name to the console at the moment
Renamed font file and removed testing code
Added file i/o

The player can enter a username and if that name is in a file with a
corresponding chips value then the player carries on playing from where
he got up to previously. At the start of each turn his new chip value is written to the file and if no file exists then one is created.