Major changes in the whole project

+ player.cpp :
ADDED: input handle, our player now moves in four directions, based on
W,S,A,D keys, aswell as Up, Down, Left, Right
+ menu.cpp, contentManager.cpp :
ADDED:  MENU_BACKGROUND texture added into the contentManager class, now
our menu has a background (which looks awesome :D)
Revert "Major changes in the whole project"

This reverts commit 5aa930f1c42cf712471473ec836f8a87c2eb846e.
Revert "Revert "Major changes in the whole project""

This reverts commit 36ef1357676d367ecbd31dd47d0252875706bc47.
Merge pull request #1 from Geheim8/Artur

Artur