* Add uri identifiers to all data source things and make them the same
1. Add uri identitifer to data-source service
2. Make <EventSource /> and <DataSource /> as close as possible
3. Add extra `.closed` method to get a list of inactive/closed/closing
data-sources from elsewhere
* Make the connections cleanup the least worst connection when required
* Pass the uri/request id through all the things
* Better user erroring
* Make event sources close on error
* Allow <DataLoader /> data slot to be configurable
* Allow the <DataWriter /> removed state to be configurable
* Don't error if meta is undefined
* Stitch together all the repositories into the data-source/sink
* Use data.source over repositories
* Add missing <EventSource /> components
* Fix up the views/templates
* Disable all the old route based blocking query things
* We still need the repo for the mixin for the moment
* Don't default to default, default != ''
The WithEventSource mixin was responsible for catching EventSource
errors and cleaning up events sources then the user left a Controller.
As we are trying to avoid mixin usage, we moved this all to an
`EventSource` component, which can clean up when the component is
removed from the page, and also fires an onerror event.
Moving to a component firing an onerror event means we can also remove
all of our custom computed property work that we were using previously
to catch errors (thrown when a service etc. is removed)
John Cowen