Refactore Runtime handlers and providers

• Move all handlers to handlers.rs
• Move all providers to providers.rs
• Make Treasury::account_id() a constant

runtime/common/src/handlers.rs

@@ -15,7 +15,10 @@
 // along with Duniter-v2S. If not, see <https://www.gnu.org/licenses/>.
 
 use super::{entities::*, AccountId, IdtyIndex};
-use frame_support::{pallet_prelude::Weight, traits::UnfilteredDispatchable};
+use frame_support::{
+    pallet_prelude::Weight,
+    traits::{Imbalance, UnfilteredDispatchable},
+};
 use pallet_smith_members::SmithRemovalReason;
 use sp_core::Get;
 
@@ -178,3 +181,27 @@ impl<
         !pallet_authority_members::Pallet::<Runtime>::online().contains(idty_index)
     }
 }
+
+type CreditOf<T, Balances> = frame_support::traits::tokens::fungible::Credit<T, Balances>;
+pub struct HandleFees<T, TreasuryAccount, Balances>(
+    frame_support::pallet_prelude::PhantomData<T>,
+    frame_support::pallet_prelude::PhantomData<TreasuryAccount>,
+    frame_support::pallet_prelude::PhantomData<Balances>,
+);
+impl<T, TreasuryAccount, Balances>
+    frame_support::traits::OnUnbalanced<CreditOf<T::AccountId, Balances>>
+    for HandleFees<T, TreasuryAccount, Balances>
+where
+    T: frame_system::Config,
+    TreasuryAccount: Get<T::AccountId>,
+    Balances: frame_support::traits::fungible::Balanced<T::AccountId>,
+{
+    fn on_nonzero_unbalanced(amount: CreditOf<T::AccountId, Balances>) {
+        // fee is moved to treasury
+        let _ = Balances::deposit(
+            &TreasuryAccount::get(),
+            amount.peek(),
+            frame_support::traits::tokens::Precision::Exact,
+        );
+    }
+}