Actually pass all the information to the driving agents

[Henrik Heimbuerger]

The driving agents currently get no parameters on their poll() function, pass the actual values in.

[Henrik Heimbuerger]

fix via additional poll() parameters

[SVN]

New commit by hheimbuerger (revision [499]):
[Partial fix for ticket #154] The driving agents now receive information about them, their competitors and the track.

This was carried out by adding two parameters to the activate() method of the CarController, the track and the list of players.

Additionally, a getLastSignal() method was introduced on the CarController. This is used by the TrackWidget to draw the thrust gauges and may actually be called before the first poll() (due to the way the race start initialization phase is performed) but never before activate(). The default implementation just invokes poll().

Using the now available data, a new driving agent has been introduced that cares a little more about the track he's driving on.