Refactor text visualizer to use buffered updates #1446
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Since the default text visualizer has the broadest compatibility with all data types, it is increasingly used to inspect all kinds of data including high-throughput event streams. Unfortunately, this can place a high load on visualizers and cause stalls by refreshing complex text boxes at a high frequency.
This PR refactors the default text visualizer to use buffered updates. It also extends the default buffered visualizer interface to allow having a single control refresh per buffer and configurable target update interval.