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Only split when they're needed, instead of pre-determining whether I'll need the subtopics. This makes the coming refactor of authentication easier. Also treated user properties with the same brush a bit. Downside: it now always assigns user properties to newly constructed publish objects, even if they are not needed (because the generated packet may only be needed for writing to the client's output buffer). But determining the flow of when and when not they'll be needed is impossible with the coming authentication refactor.
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This prevents bugs because the calling context forgets it. A (small) downside is that I have to make the Publish argument non-const. But, that's exactly what it is then, so...
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I think it's correct, but mosquitto_sub doesn't seem to support it, so I can't test. Also some other stuff I happen to see.
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And one line about correlation data that was a bug.
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I need to decide what to do with getPublishData and that disabled test needs repurposing.
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This is a preparation for MQTT5, because when there are receivers and publishers with different protocols, you can't always just write out the same packet. You can sometimes though, so that's what the copy factory determines.