Improve sentry integration

[j005u]

Specifically, I think we should:

• Add custom sentry exceptions when when things such as opkg repo refresh, package install or updates fail with any kind of error
  • More broadly this should apply to any unexpected errors which we don't handle gracefully
• console.log() all adb shell calls so we have breadcrumbs when those exceptions do happen

This would've made tracking down the wget 255 errors a lot easier and I'm sure this won't be the last time we could use such debug data. Having custom sentry exceptions might also help us catch these things before users report them.