Update license header and scripts (#8666)

* 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

ethcore/src/client/test_client.rs

@@ -1,4 +1,4 @@
-// Copyright 2015-2017 Parity Technologies (UK) Ltd.
+// Copyright 2015-2018 Parity Technologies (UK) Ltd.
 // This file is part of Parity.
 
 // Parity is free software: you can redistribute it and/or modify
@@ -704,7 +704,6 @@ impl BlockChainClient for TestBlockChainClient {
 			.map(|header| self.spec.engine.extra_info(&header))
 	}
 
-
 	fn block_status(&self, id: BlockId) -> BlockStatus {
 		match id {
 			BlockId::Number(number) if (number as usize) < self.blocks.read().len() => BlockStatus::InChain,