decouple balances from some modules (#1641)

* decouple balances from some module by creating a new traits in support/traits
* improve decl_event

substrate/node/executor/src/lib.rs

@@ -32,7 +32,7 @@ mod tests {
 	use substrate_executor::{WasmExecutor, NativeExecutionDispatch};
 	use parity_codec::{Encode, Decode, Joiner};
 	use keyring::Keyring;
-	use runtime_support::{Hashable, StorageValue, StorageMap};
+	use runtime_support::{Hashable, StorageValue, StorageMap, traits::Currency};
 	use state_machine::{CodeExecutor, Externalities, TestExternalities};
 	use primitives::{
 		twox_128, Blake2Hasher, ChangesTrieConfiguration, ed25519::{Public, Pair}, NeverNativeValue

substrate/node/runtime/src/lib.rs

@@ -65,8 +65,8 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("node"),
 	impl_name: create_runtime_str!("substrate-node"),
 	authoring_version: 10,
-	spec_version: 24,
-	impl_version: 24,
+	spec_version: 25,
+	impl_version: 25,
 	apis: RUNTIME_API_VERSIONS,
 };
 
@@ -141,11 +141,13 @@ impl session::Trait for Runtime {
 }
 
 impl staking::Trait for Runtime {
+	type Currency = balances::Module<Self>;
 	type OnRewardMinted = Treasury;
 	type Event = Event;
 }
 
 impl democracy::Trait for Runtime {
+	type Currency = balances::Module<Self>;
 	type Proposal = Call;
 	type Event = Event;
 }
@@ -165,6 +167,7 @@ impl council::motions::Trait for Runtime {
 }
 
 impl treasury::Trait for Runtime {
+	type Currency = balances::Module<Self>;
 	type ApproveOrigin = council_motions::EnsureMembers<_4>;
 	type RejectOrigin = council_motions::EnsureMembers<_2>;
 	type Event = Event;