089ce8f0fb Deprecate `Script::is_provably_unspendable` (Martin Habovstiak)
Pull request description:
This method is not really that useful because it checked an arbitrary condition. There already exists `OP_RETURN` semantics and the method didn't cover all possible ways the script may be invalid.
This deprecates the method and documents why.
Closes#2191
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Tree-SHA512: 044f1c06fb8cbea4f84817be41bf10315f690b2a42748a07c1dd1eb0ba10932456780956fc628fec4bf57fe0722129537874a77be482d6660f9e02de5fc5a8a0