Improve fees module (#1821)
* remove amount associated * make a new trait to bound some arithmetics to balances or assets: It also remove arithmetic bounds of srml-support::traits::Currency. To update your code then use srml_support::traits::ArithmeticType like: `type Currency: ArithmeticType + Currency<Self::AccountId, Balance=BalanceOf<Self>>; ` with `type BalanceOf<T> = <<T as Trait>::Currency as ArithmeticType>::Type; ` * improve decl_storage when it explicit serde bound: basically don't try to be smarter than rust and just use where clause.
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