Formatting a string on a variadic parameter function without using GC

[David G. Maziero via Digitalmars-d-learn]

I forgot to add that the "RenderText(font,0,0,"FPS: 
"~to!string(fps));" was an older version where it wasn't const 
char *, but string. And I was using a foreach, so no 
null-termination. But that's beyond the point of not using GC.