Removed the event properties in CreateCompositeProperties

[dpsenner]

In order to increase the speed up operations in almost x10 times of using properties in the output when UserName and Identity information are not needed.

[dpsenner]

There is an issue for this too (LOG4NET-429).

[dpsenner]

The patches available as attachments on issue LOG4NET-429 look more sensible to me. This patch simply removes this feature and thus breaks current behavior. In my eyes this is not a great deal.

[fluffynuts]

Good day

It's been quite a while since this PR last saw activity. In an attempt to get pull requests under some semblance of
order, I'm having to make the uncomfortable decision to jettison pull requests which have been dormant for quite some
time. Perhaps arbitrarily, I'm choosing all pull requests which have not seen activity this year (2021), most of
which are marked as not building or have conflicts with the main branch.

This is not because the contributions aren't valuable - it's simply a matter of being the only person spending
some time on this and being a little overwhelmed. I'd rather get some traction on newer issues than continue
to try to understand, upgrade and work through PRs which don't build or which conflict with the main branch,
or which simply may have been solved in the mean time.

I encourage you to re-submit the PR against the current main branch if the issue is still significant. Your
contributions are appreciated. I apologise for any inconvenience caused and sincerely hope that you understand
the constraints involved which have brought me to the place of making this decision.