DappRegistry (#3405)

* Initial version, just loading

* Warning dialog

* Retrive & show applications

* Display completed

* Edit/New mode start

* Display distry state, resolve hashes to urls

* Move buttons to top-level

* Rework display

* Update error handling & dirty checks

* Formatting

* Split sections into components

* Styling updates

* Slight styling adjustments

* Start delete modal

* Add modals for register & update

* Flesh-out register modal

* Register error handling

* Register registers

* List refresh on add & remove

* Update operational

* Simplify, remove bg image

* Really remove bg

* fix case

* Collapse text-only components