Error handling

[wildeyedskies]

We need to be helpful when things break

[xxxserxxx]

@wildeyedskies This is partially addressed by 47d8f766e2, which added a logging tab and replaced many of the silent swallowing of errors with messages to this tab. There could be more done here, such as alerting the user that there's something to look at in the tab. Also, not every error is dumped to that panel, and we don't actually add any useful instructions when there's an error (it's just Printf'd) there.

In any case, I wanted to link that commit to this ticket.