Commits on May 7, 2021

1. txscript: Split signing code to sign subpackage. …

   The current code for handling signing standard scripts resides in
   txscript and depends on parsing and creating standard scripts.  This
   poses a problem for future work which intends to split the standard
   script handling from the consensus critical code since that code will
   also need to depend on txscript and therefore would result in a circular
   dependency.
   
   In order to pave the way for splitting the standard script handling
   without running into the aforementioned issue, this moves all of the
   signing code in the txscript package to a new subpackage named sign.
   
   As an aside, the signing code really never fit very well in the txscript
   package anyway and it only exists there because it was not possible to
   parse scripts outside of the package back when the original code was
   implemented.  However, that limitation no longer exists.
   
   It should also be noted that this only does the minimum work necessary
   to move the code and does not update it otherwise since future work
   plans to replace it with a much more robust architecture that properly
   handles things such as different script versions and non-standard
   scripts which the current code does not handle.

   

   davecgh committed May 7, 2021
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