Catch exceptions in continue mode

Sorry if there is already a way to do this, I didn't see it. If you are stepping through the debugger and an exception is thrown, you the debugger catches it, and you can analyze it. But if the debugger is just running (i.e., you pressed `c` to continue), exceptions are not caught, but rather the whole thing exits with a traceback. It would be nice if these exceptions were also caught.

Start by tracing the debugger's continue path after pressing `c`, then compare it with the stepping path that catches exceptions. Use the project's pytest suite to reproduce an exception in continue mode; done means the exception is caught for analysis instead of terminating with a traceback.

Written by the indexing model from the issue text.