Fairly regular and unexplained terminations of launcher service on Windows

[RebeccaMahany]

Event logs on Windows contain The LauncherKolideK2Svc service terminated unexpectedly fairly frequently. These are sometimes expected -- for example, when launcher autoupdates -- but I still see one or two a day that don't have a corresponding explanation in the launcher logs.

We had thought that these could be explained by throttling issues with modern standby (more details here), but I saw one happen while regression testing last week while my laptop was awake, so I think something else is going on.

We should try to write corresponding launcher logs when this event occurs -- maybe there's somewhere we're missing a call to recover?

The relevant event logs can be found by filtering Windows Logs => System with:

<QueryList>
  <Query Id="0" Path="System">
    <Select Path="System">*[System[Provider[@Name='Service Control Manager'] and (EventID=7031)]]</Select>
  </Query>
</QueryList>

[directionless]

Ha. This issue was prescient. I think it's fixed by #1692 and the other recent panic work. And there's some cleanup in #1699