Wladimir J. van der Laan e012f3cea0 util: Add ParseUInt32 and ParseUInt64 ...

Add error and range-checking parsers for unsigned 32 and 64 bit numbers.
The 32-bit variant is required for parsing sequence numbers from the
command line in `bitcoin-tx` (see #8164 for discussion). I've thrown in
the 64-bit variant as a bonus, as I'm sure it will be needed at some
point.

Also adds tests, and updates `developer-notes.md`.

2016-06-08 10:28:51 +02:00

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