[Toybox] include guard

[Alex]

I just took a brief look a the source code for some of the components in
this project, which BTW I think is a great and the code looks really neat,
and saw the use/need of includes to toys.h in many files.  I was wondering
why you don't have an include guard like...

#ifndef _TOYS_H
#include "toys.h"
#define _TOYS_H
#endif

...instead of the one-liner includes to make sure, in this case, toys.h is
not been added several times over?  Sorry if this is been taken care some
place else and I didn't see it.

Thanks, Alex
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