[Fluxus] the test

[RPD]

This shows the sort of thing I want. With the original FluxusMain.cpp, the
background will turn bright blue, the editor text will never fade away,
and the square will "overexpose" a white hoop, when the editor is hidden. 

(require racket/math)
(clear)
(blur 0.005)
(colour (vector 0.2 0.03 0.015))
(clear-colour (vector 0 0 0.01))
(blend-mode 'one 'one)
(define aplane (build-plane))

(every-frame
    (with-primitive aplane
        (identity)
        (let ([t (* 0.4 (time))])
            (translate (vector (sin t) (cos t) 7.7))
            (rotate (vector 0 0 (/ (* 360 t) pi))))
        )
    )