Added Kalman filter for localization.
Added matix.py file for matrix operations.
Moved all printing to report.py
Added wind change functionality.
Added function env.is_finished to determine the end of simulation. Also added parameter max_nr_of_steps to stop the simulation after it reaches this number of steps.
Added plotting of the boat agent's believed position.
Added printing wind change data.
True_sailboat now adds noise to the measurements.