message: update implementation

Add more of the Message class (and various helpers), which are to replace all
the `mu-msg-*` code.

Add more tests.
This commit is contained in:
Dirk-Jan C. Binnema
2022-03-26 16:19:08 +02:00
parent 55402622b9
commit 37988b5a26
12 changed files with 2056 additions and 412 deletions

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