use * for pointer type instead of &

See #770

To help automatically translate code, see the
zig-fmt-pointer-reform-2 branch.

This will convert all & into *. Due to the syntax
ambiguity (which is why we are making this change),
even address-of & will turn into *, so you'll have
to manually fix thes instances. You will be guaranteed
to get compile errors for them - expected 'type', found 'foo'

std/math/complex/pow.zig

@@ -4,7 +4,7 @@ const math = std.math;
 const cmath = math.complex;
 const Complex = cmath.Complex;
 
-pub fn pow(comptime T: type, z: &const T, c: &const T) T {
+pub fn pow(comptime T: type, z: *const T, c: *const T) T {
     const p = cmath.log(z);
     const q = c.mul(p);
     return cmath.exp(q);