App to handle default app for opening file.

This is generally used by window managers, but an app's client could also access the methods.

Silk/appDefaults

params: mime

returns:

{
  default: name of default app
  available: [array of apps that can open the mime]
}

Silk/setDefault

param: data

{
  mime: mime,
  app: name of app
}

If you want a different implementation, you can remove this app and create your own that provides these two methods.