Added a README for the source code, with the new proposed directory structure
Completely changed the source directory hierarchy.

I'm trying to create a standard for my small pseudo game engine
for ncurses games.

See file `src/README.md` for more information on this.
Fixed all "#include" statements on all files

All thanks to this neat Ruby script I made to refresh
"#include"s, check it out:

https://gist.github.com/alexdantas/041a88f31847ecda2016