CAKE-120 | added xmr.to exchange description to exchange and exchange template pages; made observable isReceiveAmountEntered parameter in the exchange view model; added isReceiveAmountEntered parameter to applyTemplate() (exchange page) and reset() (exchange view model); added possibility to enter amount in receive card (exchange template page)

lib/view_model/exchange/exchange_view_model.dart

@@ -93,6 +93,7 @@ abstract class ExchangeViewModelBase with Store {
   @observable
   bool isReceiveAddressEnabled;
 
+  @observable
   bool isReceiveAmountEntered;
 
   Limits limits;
@@ -256,6 +257,7 @@ abstract class ExchangeViewModelBase with Store {
 
   @action
   void reset() {
+    isReceiveAmountEntered = false;
     depositAmount = '';
     receiveAmount = '';
     depositCurrency = CryptoCurrency.xmr;