Rework of visible entitytity system, it's now stored in the Entity.cpp and nothing will happen if it's not set to true

Major rework of Sprite.cpp, all textures are now loaded through Texture:: and tiles and sprites are seperated

Finally fixed the damn grabscreen() error, it was caused by drawing in the update loop. Also added tile files for tile class

The world now loads only when it's needed and a copy is made of the screen. This is much more effcient

Added 2d vector called worldMatrix to the World, it will read an entire line and then push the vector into the matrix