Move Relay-Specific Shared Code to One Place (#1193)

* add common libs

* asset hubs

* add westend

* bridge hubs

* collectives

* contracts

* emulated tests

* parachain bin

* delete collectives constants and update docs

* integration tests should have apache license (some missing, some needed changing)

* propagate features

* fmt

cumulus/parachains/common/src/lib.rs

@@ -16,6 +16,10 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 pub mod impls;
+pub mod kusama;
+pub mod polkadot;
+pub mod rococo;
+pub mod westend;
 pub mod xcm_config;
 pub use constants::*;
 pub use opaque::*;