These unwraps and indexing (which hide more panic paths) irritated me, and also
would need to be tweaked once we get rid of the Hash::from_slice methods. I
figured I'd preemptively get rid of them.

I don't *think* it's possible to create a rangeproof with a sidechannel smaller
than 64 bytes (if you create a 0-sized "proof of exact value" then unwinding
will fail entirely, and anything larger I think has at least one ring, so 128
bytes or more). Unsure.

But better not to assume this by indexing recklessly into the sidechannel
message.

We should redo the error types here as well at some point.

Currently we allow decoding segwit v0 programs which have uncompressed/hybrid
keys (not allowed) and I suspect that if you provide a too-short address then
you'll get a panic here.

Lol, this code was so close and yet so far.

pset

982a50f Disable fuzztest in CI (Philip Robinson)
ad00563 Bump version to 0.25.3 (Philip Robinson)
6275989 Fix docstring in blech32 (Philip Robinson)
675ca26 Pin deps for Fuzztest job (Philip Robinson)
ea42e11 add `--no-deps` to doc test (Philip Robinson)
70276cc pin bitcoin crates in test.sh (Philip Robinson)
2941a39 Remove `-- -D warnings` from test.sh (Philip Robinson)
250c4f6 pset: fix slicing in KeySource::deserialize (Philip Robinson)
b06dac9 address: do a better job slicing bech32 data (Philip Robinson)
2a8b46f transaction: use better error typing for pegin destructuring (Philip Robinson)
8b15649 blind: use array splitting in TxOut::unblind (fix potential DoS?) (Philip Robinson)
179c6da rewrite Address::from_base58 to eliminate all the unwraps (Philip Robinson)
8cd2a4d Add arrays.rs and slices.rs from bitcoin-internals 0.5 (Philip Robinson)

Pull request description:

  There are a number of useful improvements from #279 we would like to include in 0.25.x.

ACKs for top commit:
  apoelstra:
     utACK 982a50f

Tree-SHA512: 51f786c01982d107193f9e75be13a1087a24372664eb70fbbb0eb3ee3d2bfbf64b94ac573a22fe20d412c717f54d5c3a37a4010099fe6d56892fdd486e026c62