Surivor changed to Human, for better contast with zombie
First steps of the big refactor: the game will be played programming a team of players
Max_life constants for thing, zombie, human
Boxes have life, and a speciall class for wall segments is used
Correctly implemented healing
Implemented the draw method for things
Renamed main_loop to play, and updated run.py
A world requires a list of things
Bugs on things initialization, and now they are optional
Small bugs on the main loop
Correct parameters of Thing when creating the empty_thing
Method to add things
More detailed results for actions
Renamed SolidBox to Box
Fixed check for precense
No need to inform position on the step method
For complex things, add each part separately
Missing parenthesis
Return the walls on Building.create_parts
Brown does not exist, use yellow