wallet: add input weights to CCoinControl

In order to allow coin selection to take weights from the user,
CCoinControl needs to be able to set and get them.

Author: achow101

src/wallet/coincontrol.h

@@ -115,9 +115,28 @@ class CCoinControl
         vOutpoints.assign(setSelected.begin(), setSelected.end());
     }
 
+    void SetInputWeight(const COutPoint& outpoint, int64_t weight)
+    {
+        m_input_weights[outpoint] = weight;
+    }
+
+    bool HasInputWeight(const COutPoint& outpoint) const
+    {
+        return m_input_weights.count(outpoint) > 0;
+    }
+
+    int64_t GetInputWeight(const COutPoint& outpoint) const
+    {
+        auto it = m_input_weights.find(outpoint);
+        assert(it != m_input_weights.end());
+        return it->second;
+    }
+
 private:
     std::set<COutPoint> setSelected;
     std::map<COutPoint, CTxOut> m_external_txouts;
+    //! Map of COutPoints to the maximum weight for that input
+    std::map<COutPoint, int64_t> m_input_weights;
 };
 } // namespace wallet