Use updated version of cpp-util
Add new parameter LookaheadType
Allow multiple files for one --neural-network argument
Move drawing from Model to RealTimeGameManager.

Now drawing of track boundary and checkpoints can be switched on/off
independently. Fixes #59.
Remove unused, commented out code
Correct checkpoint drawing problem
Move drawing of track from Track to RealTimeGameManager
Draw lookahead checkpoints with different color
Create center line for tracks based on checkpoints
Update readme for center line
Merge pull request #81 from petersohn/master

Enhancements