This adds an optional key parameter to alertsShowAlert() to allow
overriding the key. This allows us to call flashProgress using that
action instead of having to use the toaster directly.
Instead of rendering the toaster separate from the main index, add it
there so we can inherit all of the context providers. This requires
passing the ref object instead of the toaster instance itself, so
sagas have to be updated.
Since we are using the react-i18n babel loader plugin, useI18n can only
be used once per file. Also we have to remember to add the istanbul
ignore next comment each time we use it. By moving this to a common
file, it can be easily copied and pasted when a new submodule is
created and we don't have to remember the rules when calling it.
This starts moving alerts to the same subsystem where they are relevant
instead of putting everything in notifications.
So far, only the explorer file in use error is handled like this.
David Lechner