Code a DOOM-like game engine from scratch in C [PART I]

This is part I of the DOOM-like game engine from scratch tutorial.

It introduces the basics of 2.5D (Pseudo-3D) graphics rendering and movement mechanics. Also concepts such as portals, rendering, world transformations, and others.

You can download the source code from here: https://github.com/jeuxdemains/DOOM-l...

Some notes to keep in mind about Part I:
- we do the minimal required work to get started
- code style is not really the focus here
- back-to-front rendering (i.e. Painter's algorithm) is a bad idea, it will be revisited in Part II
- sorting sectors by their centroids with bubble sort is very inefficient and lacks precision -- it's there just to leave you with a bit more compete solution until part II comes out

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