Commits on Sep 21, 2023

1. Add transaction::Version data type …

   BIP-68 activated a fair while ago (circa 2019) and since then only
   transaction versions 1 and 2 have been considered standard.
   
   Currently in our `Transaction` struct we use an `i32`, this means users
   can construct a non-standard transaction if they do not first look up
   what the value should be. We can help folk out here by abstracting over
   the version number.
   
   Since the version number only governs standardness elect to make the
   inner `i32` public (ie., not an invariant). The aim of the type is to
   make life easy not restrict what versions are used.
   
   Add transaction::Version data type that simply provides two consts `ONE`
   and `TWO`.
   
   Add a `Default` impl on `Version` that returns `Version::TWO`.
   
   In tests that used version 0, instead use `Version::default` because the
   test obviously does not care.

   

   tcharding committed Sep 21, 2023
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