Upgrade to Vertx 4 #38
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Upgrade to Vert.X 4.
See https://vertx.io/docs/guides/vertx-4-migration-guide/#handling_deprecations_and_removals_what-is-new-and-different-in-vertx-4
Promises were introduced in Vert.X 4, and so some changes were required to make new methods which utilize these Promises.
Also a couple other deprecated calls were changed.
Also two files were found to have Windows line endings so those were changed to Unix.