Rework status handling (idle and errors) in ringbuffered uart #3989
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DrTobe
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Attention: This PR contains the work from #3968 which I assume to be merged soon.
In #3979, I implemented error recovery for ringbuffered uart but this reintroduces the problem that the RX side may clear TX flags (see #3930). So I took another attempt, now restructuring the status handling in ringbuffered uarts in general.