* Update `add_license` script
* run script
* add `remove duplicate lines script` and run it
* Revert changes `English spaces`
* strip whitespaces
* Revert `GPL` in files with `apache/mit license`
* don't append `gpl license` in files with other lic
* Don't append `gpl header` in files with other lic.
* re-ran script
* include c and cpp files too
* remove duplicate header
* rebase nit
* Tests for RPC
* Extracting dapp_id from Origin and x-parity-origin
* Separate type for DappId
* Persistent tracking of recent dapps
* Fixing tests
* Exposing dapp timestamps
* Fixing import to work on stable
* Fixing test again
* Address book for local addresses.
* Simple disk-backed address book.
* Add test and keep file with keys.
* View and import Geth keys.
* Fix test.
* Fix up author info.
[ci:skip]