allow pasting multiline lyrics into lyrics dialog

Author: oxygen-dioxide

OpenUtau/Views/LyricsDialog.axaml

@@ -13,7 +13,7 @@
   </Window.Styles>
   <Grid Margin="10,10,10,4" RowDefinitions="*,6,Auto,4,Auto">
     <TextBox Name="DIALOG_Box" Grid.Row="0" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"
-             AcceptsReturn="False" AcceptsTab="False" TextWrapping="Wrap" Height="NaN"
+             AcceptsReturn="True" AcceptsTab="False" TextWrapping="Wrap" Height="NaN"
              Text="{Binding Text}" Focusable="True"/>
     <TextBlock Grid.Row="2" Text="" Margin="0,2" HorizontalAlignment="Right">
       <TextBlock.Text>