Figure out which exceptions we can safely ignore (uwp)

[paulrouget]

These are the default exceptions that VS will break on if they are thrown:

Selecting all the exceptions shows that we have some other exceptions occurring that we ignore. For example, breaking on all the exceptions makes it impossible to start Servo on the device.

Maybe the default configuration is enough. Maybe we should run Servo in strict mode (break on all exceptions).

[jdm]

So far the defaults appear to be working out ok.