v0.0.5 - A major minor step.

Hi all! Now, this may look like a minor release on the outside, but it is actually a great improvement code-wise. I've reworked  the gui rendering. It is much, much nicer to work with it now. I've also added a few stuff, mostly related to guis. Here is the changelog:

-Reworked on the 2d rendering engine.

-Changed window title.

-You can now use the mouse wheel and the number keys and the - and + keys to select inventory slots. (also works on inventory)

-Minor work related to items.

-Added a cross so you can know where you're aiming (finally).

Like, I'm  actually starting to get satisfied with the state the game is on, I think. What really scares me is the collision rewrite I will eventually have to do. I'm very bad at collision, especially when it is 3d. Anyway, enough talking. See ya!