Visible accounts for dapps (default whitelist) (#3898)

* Add APIs for Dapp management

* Move AddDapps modal

* Add DappsPermissions Modal (basics)

* Allow whitelist editing

* Add select/unselect tests

* Case

* Case

* Modal render/non-render tests

* UI made slightly prettier

* Adjust spacing

* Allow get/set of null for default whitelist (all)

* Allow null = all for selection

* Adjust selected background

* Address valid comment on formatters location