Changed font file

new font used is now "nevis.ttf"
Changed main.cpp
Added CUnit class
Added CPupil Class
Added CLogfile Class

and needed Singleton class
Integrated all old files successfully in the new project
Added basic CGame class for general game managing purposes
Added forgotten files CGame.hpp & CGame.cpp to the reposetory
Integrated the loading of Textures to an other function
Modified the graphics of 'Teacher_normal.png' & 'Pupil_normal.png' and added an image for the startscreen
Merge branch 'FileIntegration' into dev
First implementation of different Gamestates
Finished the raw implementation of the Gamestate arcitecture
Fixed a small bug in the logfile
deleted File with Gamestate overview

the overview is now included in Gamestate.h as an enum
Pupil graphics are now loaded in CPupil; small displaying error with last Sprite drawn
Moving Teachers (without Time affection but at least
Now Teachers move with Time integrated
First step taken
First step taken