Update for latest SFML

mv Back BackSpace, rm sf::Font#getDefaultFont
Refactor makefile
Ignore executable
whitespace
Use C++11. Fuck Windows and its shitty compilers
load font from cwd
Remove commented out sound code
Refactor color code. Change text color after ready
Ensure text is always drawn on top of players
Refactoring. Remove commented code
Refactor match ending code