(gfx:clear-canvas time canvas [colour])
Clears the entire canvas (totally transparent) or to a colour if provided.
canvas -- the canvas to clear
colour -- optional colour to clear with (where colour is an (r g b a) list)
time -- time in samples
(gfx:clear-canvas (now) *canvas*)
(gfx:clear-canvas (now) *canvas* '(0 0.24 0.5 1.0))
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