Pass EvaluationId to ProjectStarted event

[KirillOsenkov]

It is very useful to associate ProjectStarted with the evaluation used for the build. We have the MS.B.E.ProjectInstance in ProjectLoggingContext, so pass that to LogProjectStarted.

Fixes #4926

[KirillOsenkov]

Now we can correlate project builds with evaluations:

We will now also show accurate preprocessed XML because we will be using the right set of ProjectImported events to stitch together the final text depending on which project we're preprocessing.

Another thing I'm thinking is logging Properties and Items per evaluation, not per project. So if multiple projects were built using the same evaluation, we can log only once, saving time and space in the binlog.

[rainersigwald]

Awesome, this has been annoying me too.