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

test/client/src/block_builder.rs

@@ -15,7 +15,7 @@
 // along with Cumulus.  If not, see <http://www.gnu.org/licenses/>.
 
 use crate::{Backend, Client};
-use cumulus_primitives::{
+use cumulus_primitives_core::{
 	inherents::{SystemInherentData, SYSTEM_INHERENT_IDENTIFIER}, PersistedValidationData,
 };
 use cumulus_test_runtime::{Block, GetLastTimestamp};