`std.typecons.Ternary.opBinary` supports `bool` bitwise operands

Now $(REF Ternary, std, typecons) can be used in bitwise operations with `bool`s:

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import std.typecons : Ternary;

Ternary a = Ternary(true);
assert(a == Ternary.yes);
assert((a & false) == Ternary.no);
assert((a | false) == Ternary.yes);
assert((a ^ true) == Ternary.no);
assert((a ^ false) == Ternary.yes);
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