The moves the blockchain package from the blockchain module to an
internal package of the root module meaning that it is no longer a part
of the exported blockchain module. Nearly all of the logic it provides
is really for the internal implementation of dcrd itself and thus having
it exported module significantly increases the maintenance burden.
Note that as of this change the blockchain module still exists and
provides the chaingen and fullblocktests packages both or which are
useful and used by external consumers.
This is part of a continuing overall effort to reduce the total number
of exported packages and modules and eventually get to the point it will
be possible to follow semver for the root module.
Overview of the major changes:
- Move all go files from blockchain -> internal/blockchain
- Move testdata from blockchain -> internal/blockchain
- Remove doc.go in favor of the README.md since godoc now displays it
- Move README.md from blockchain -> internal/blockchain and update to
match the new reality
- Add a new README.md in the exported blockchain module that documents
it contains the remaining exported packages
- Update all import paths in the repository accordingly
- Run go mod tidy on all modules
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