The great refactor (#325)

* Move pallets to pallets folder and rename them

* Move genesis file to service

* Rename primitives to primitives-core

* Delete cumulus-runtime

* Move stuff to client folder and rename

docs/overview.md

@@ -13,7 +13,7 @@ messages of other Parachains.
 To convert a Substrate runtime into a Parachain runtime, the following code needs to be added to the
 runtime:
 ```rust
-cumulus_runtime::register_validate_block!(Block, Executive);
+cumulus_pallet_parachain_system::register_validate_block!(Block, Executive);
 ```
 
 This macro call expects the `Block` and `Executive` type. It generates the `validate_block` function