Allow multiple return values to be used in array declarations

[ftphikari]

Color_RGBA :: [4]u8
Color_RGB :: [3]u8

a: Color_RGB = {255, 255, 255}
b: Color_RGBA = {expand_values(a), 255}

Which is shorthand for:

t1, t2, t3 := expand_values(a)
b: Color_RGBA = {t1, t2, t3, 255}

I don't know if it's a good idea, but shader languages do it no problem.