Support for !constraint

[Wikunia]

In certain situations it would be nice to be able to write

@constraint(m, !(x == 1 && y == 1))

instead of reformulating to

@constraint(m, x != 1 || y != 1)

One needs to implement: parse_one_operator_constraint(::Function, ::Bool, ::Val{:!}, ::Expr)
Maybe the best way to support this by using a bridge that only supports this type if the anti constraint is supported.

[Wikunia]

Done in #264