Linux Build! (And a bugfix)

I promised a Linux build this week and so i made one!

Nothing much to say, other than the fact that i have also fixed some bugs here :

• The window was able to be resized in the Linux build of the Main Engine, which was not intended, as the game was only meant to render 1024x768 (I will eventually make it so that it works on any resolution, though! Stay tuned...
• The score was not resetting if it was lower than the high score, slight oversight