0386f910d1
In the legacy VS Code DAP, we would deserialise the Flutter.Error event and provide some basic colouring (eg. stack frames are faded if not from user code and the text is split between stdout/stderr to allow the client to colour it). In the new DAPs we originally used `renderedErrorText` which didn't support either of these. This change adds changes to use the structured data (with some basic parsing because the source classes are in package:flutter and not accessible here) to provide a similar experience. It would be nicer if we could use the real underlying Flutter classes for this deserialisation, but extracting them from `package:flutter` and removing all dependencies on Flutter is a much larger job and I don't think should hold up providing improved error formatting for the new DAPs. Some comparisons:  
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