Coincontrol cleanup (e.g. add missing license)

- add missing license headers
- make compatible with Qt5
- enforce header cleanup style
- small code style cleanups
- rename Coin Control dialog into Coin Control Address Selection
- use default font for the windows labels (no monospace)

src/qt/optionsmodel.cpp

@@ -292,12 +292,11 @@ bool OptionsModel::setData(const QModelIndex & index, const QVariant & value, in
         case Language:
             settings.setValue("language", value);
             break;
-        case CoinControlFeatures: {
+        case CoinControlFeatures:
             fCoinControlFeatures = value.toBool();
             settings.setValue("fCoinControlFeatures", fCoinControlFeatures);
             emit coinControlFeaturesChanged(fCoinControlFeatures);
-        }
-        break;
+            break;
         default:
             break;
         }
@@ -312,11 +311,6 @@ qint64 OptionsModel::getTransactionFee()
     return (qint64) nTransactionFee;
 }
 
-bool OptionsModel::getCoinControlFeatures()
-{
-    return fCoinControlFeatures;
-}
-
 bool OptionsModel::getProxySettings(QString& proxyIP, quint16 &proxyPort) const
 {
     std::string proxy = GetArg("-proxy", "");