adding a PlayerManager file

new file:   include/PlayerManager.hpp
new file:   src/player/PlayerManager.cpp
file renaming

modified:   include/Player.hpp
renamed:    include/Player.hpp -> include/PlayerHandler.hpp
renamed:    src/player/Player.cpp -> src/player/PlayerHandler.cpp
some cleaning and implementation of player manager

modified:   include/CardBuilder.hpp
modified:   include/Player.hpp
modified:   include/PlayerHandler.hpp
modified:   include/PlayerManager.hpp
modified:   src/player/PlayerHandler.cpp
modified:   src/player/PlayerManager.cpp