Create a function IsCasher to filter consumables

[todo]

eiko/misc/consumable/consumable.go

Lines 37 to 42 in 3d415fb

	// TODO: Create a function `IsCasher` to filter consumables
	return true
	}
	// ContainSodium return true is the consumable contain salt
	func ContainSodium(c structures.Consumable) bool {

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This issue was generated by todo based on a TODO comment in 3d415fb when #19 was merged. cc @eiko-team.