refactor: merged sources of mail-headers,mail-internals,mail-core, mail

Originally it was palaned to do a merge with `--allow-unrelated-history`
but this can not be doesn as `mail-core` has a "invalid" history which
has a merge conflict **with itself**. So even rewinding the history on
a empty repo is not possible.

Instead the code was directly coppied over losing history.

But the history is still available in the different
`history-backup-*` branches. It is just that the past history
is decoupled from the current history.

1 files changed, 25 insertions, 0 deletions

diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..b25ff75
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,25 @@
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