Add candidate info to OccupiedCore (#2134)

* guide: add candidate information to OccupiedCore

* add descriptor and hash to occupied core type

* guide: add candidate hash to inclusion

* runtime: return candidate info in core state

* bitfield signing: stop querying runtime as much

* minimize going to runtime in availability distribution

* fix availability distribution tests

* guide: remove para ID from Occupied core

* get all crates compiling

polkadot/runtime/test-runtime/src/lib.rs

@@ -631,7 +631,7 @@ sp_api::impl_runtime_apis! {
 			runtime_impl::validator_groups::<Runtime>()
 		}
 
-		fn availability_cores() -> Vec<CoreState<BlockNumber>> {
+		fn availability_cores() -> Vec<CoreState<Hash, BlockNumber>> {
 			runtime_impl::availability_cores::<Runtime>()
 		}