Some functions have documentation space in blank

Remove "global" variables:

extern bool NOX_fatal_error;
extern bool NOX_is_running;
extern int NOX_fps;

extern FILE **NOX_current_stream;
extern SDL_Rect NOX_window_rect; /* Window Position And Size */

You can use a function to get states, like:

bool NOX_HasFatalErrors(void);
int NOX_GetFPS(void);
SDL_Rect NOX_GetWindowRect(void);
/* Etc... */

Create a Scene manager.
The Scene manager can create, destroy and update Scenes.

Add config file parser
eg. ./Noxis configfile

Use json to config file

Maybe we can create some Lua API to work with this project