Complex ErfC(x) Complementary Error Function

For ErfC(x) with x.i == 0, use the real ErfC(x.r) function.

See: Real ErfC(x) Complementary Error Function
For complex x,

if x > 0, ErfC(x) = GamQ(1/2, x^2),

if x < 0, ErfC(x) = 2 − ErfC(−x).

See: Erfc -- From MathWorld
And: Wolfram Function Evaluation -- Erfc
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