add the option to choose between usd,eur,btc as currency for mainwindow Pricecheck

src/settings.cpp

@@ -105,6 +105,12 @@ bool Settings::isSaplingActive() {
 double Settings::getZECPrice() { 
     return ZECPrice; 
 }
+double Settings::getEURPrice() { 
+    return EURPrice; 
+}
+double Settings::getBTCPrice() { 
+    return BTCPrice; 
+}
 
 bool Settings::getCheckForUpdates() {
     return QSettings().value("options/allowcheckupdates", true).toBool();
@@ -122,6 +128,19 @@ void Settings::setAllowFetchPrices(bool allow) {
      QSettings().setValue("options/allowfetchprices", allow);
 }
 
+QString Settings::get_currency_name() {
+    // Load from the QT Settings.
+    return QSettings().value("options/currency_name", false).toString();
+}
+
+void Settings::set_currency_name(QString currency_name) {
+    QSettings().setValue("options/currency_name", currency_name);
+
+  
+    
+}
+
+
 QString Settings::get_theme_name() {
     // Load from the QT Settings.
     return QSettings().value("options/theme_name", false).toString();