Runtime lib restructure (#202)

* impl apis exported

* runtime version test moved to constants

* constants exported

* constant related errors fixed

* pallet configs exported

* xmc_config moved to configs

* types extracted

generic-template/runtime/src/benchmark.rs

@@ -0,0 +1,16 @@
+frame_benchmarking::define_benchmarks!(
+    [frame_system, SystemBench::<Runtime>]
+    [pallet_assets, Assets]
+    [pallet_balances, Balances]
+    [pallet_session, SessionBench::<Runtime>]
+    [pallet_timestamp, Timestamp]
+    [pallet_message_queue, MessageQueue]
+    [pallet_sudo, Sudo]
+    [pallet_collator_selection, CollatorSelection]
+    [cumulus_pallet_xcmp_queue, XcmpQueue]
+    [cumulus_pallet_parachain_system, ParachainSystem]
+    [pallet_proxy, Proxy]
+    [pallet_utility, Utility]
+    [pallet_multisig, Multisig]
+    [pallet_xcm, PalletXcmExtrinsicsBenchmark::<Runtime>]
+);