Added AntennaFlagger step to efficiently flag baselines

Duncan Kampertrequested to merge
aartfaac/DP3:antenna-flagger into master

The newly added AntennaFlagger step implements the preflagger.baselines functionality of the PreFlagger step with a better performing alternative implementation based on regular expressions.

Also see this MR on the fork for a preliminary review.

Edited by Bram Veenboer

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