Add optional Timestamp input to "Log If Error.vi"

[Ethan Stern]

I have code that passes timestamps with errors and I don’t want to lose them when logging. This is not typical for me, but applies in the case of this highly asynchronous RT Actor-Framework application.

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Added buffered log sink and test coverage, resolved issue #1, resolved issue #2, resolved issue #3, resolved issue #4, GPackage version 0.7.0

→ <<cset d4a062399a59>>