Intercept Anki's exception handler

[alexbowe]

Anki's default exception handler seems to use showInfo and strips information like the stack trace. This makes it hard to debug issues, such as #1.

We should intercept Anki's exception handler to:

1. Show more useful information (such as the exception type, the location in code [if possible], and the whole message).
2. Direct the user to submit a ticket on GitHub.
3. Log the stack trace.

If SmoothBrain moves to a web API, we should probably send the log to us (conditioned on the user opting in to submit information to us to improve the program).

[alexbowe]

Intercepting exceptions causes Anki to crash if the exceptions occur in one of Anki's Op threads. So I'd either need to make it single threaded, or make my own multithreading code (which I tried before, which also crashed Anki).

Marking this as blocked for now.

[alexbowe]

Moving this out of the error handling epic for now because I can just ask users to send the log file after #8.

[abdnh]

We can tell Anki not to intercept exceptions in CollectionOp by something like this, which will actually trigger another exception handler in Anki that shows debugging instructions and the stack trace:

def on_failure(exception: Exception) -> None:
    raise exception

CollectionOp(parent=mw, op=op).failure(on_failure).run_in_background()

We can then add specific instructions for exceptions we anticipate instead of just re-raising them.