1.1.0-RC4 for real

Prepare release 0.12.17 (com-lihaoyi#6397)

Update changelog

Pull request: com-lihaoyi#6397

Changelog for Mill 1.1.0-RC1 (com-lihaoyi#6112)

Prepare release 0.12.16 (com-lihaoyi#5904)

Print logs to console if an exception happens during mill launcher in…

…itialization (com-lihaoyi#5736)

Currently if an exception like
com-lihaoyi#5734 happens while launching
the mill daemon there is no logs to look to. This PR adds in-memory
logging and outputs that in case of failure.

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