bip174: add _IN_ to new hash preimage fields

Author: apoelstra

bip-0174.mediawiki

@@ -200,25 +200,25 @@ The currently defined per-input types are defined as follows:
 ** Value: The UTF-8 encoded commitment message string for the proof-of-reserves.  See [[bip-0127.mediawiki|BIP 127]] for more information.
 *** <tt>{porCommitment}</tt>
 
-* Type: RIPEMD160 preimage <tt>PSBT_RIPEMD160 = 0x0a</tt>
+* Type: RIPEMD160 preimage <tt>PSBT_IN_RIPEMD160 = 0x0a</tt>
 ** Key: The resulting hash of the preimage
 *** <tt>{0x0a}|{20-byte hash}</tt>
 ** Value: The hash preimage, encoded as a byte vector, which must equal the key when run through the `RIPEMD160` algorithm
 *** <tt>{preimage}</tt>
 
-* Type: SHA256 preimage <tt>PSBT_SHA256 = 0x0b</tt>
+* Type: SHA256 preimage <tt>PSBT_IN_SHA256 = 0x0b</tt>
 ** Key: The resulting hash of the preimage
 *** <tt>{0x0b}|{32-byte hash}</tt>
 ** Value: The hash preimage, encoded as a byte vector, which must equal the key when run through the `SHA256` algorithm
 *** <tt>{preimage}</tt>
 
-* Type: HASH160 preimage <tt>PSBT_HASH160 = 0x0c</tt>
+* Type: HASH160 preimage <tt>PSBT_IN_HASH160 = 0x0c</tt>
 ** Key: The resulting hash of the preimage
 *** <tt>{0x0c}|{20-byte hash}</tt>
 ** Value: The hash preimage, encoded as a byte vector, which must equal the key when run through the `SHA256` algorithm followed by the `RIPEMD160` algorithm
 *** <tt>{preimage}</tt>
 
-* Type: HASH256 preimage <tt>PSBT_HASH256 = 0x0d</tt>
+* Type: HASH256 preimage <tt>PSBT_IN_HASH256 = 0x0d</tt>
 ** Key: The resulting hash of the preimage
 *** <tt>{0x0d}|{32-byte hash}</tt>
 ** Value: The hash preimage, encoded as a byte vector, which must equal the key when run through the `SHA256` algorithm twice