Activate TextSelection on all interesting values/results (#213)

If we allow users to select texts, the application will feel more like a "Desktop app", will be easier to use on a tablet and users will be more prompt to use Ctrl+C to use the result in another app.

src/Calculator/Views/DateCalculator.xaml

@@ -459,11 +459,13 @@
                        AutomationProperties.LiveSetting="Polite"
                        AutomationProperties.Name="{Binding StrDateDiffResultAutomationName}"
                        ContextFlyout="{StaticResource ResultsContextMenu}"
+                       IsTextSelectionEnabled="True"
                        Text="{Binding StrDateDiffResult}"/>
             <TextBlock Grid.Row="10"
                        Style="{ThemeResource BaseTextBlockStyle}"
                        Foreground="{ThemeResource SystemControlPageTextBaseMediumBrush}"
                        ContextFlyout="{StaticResource ResultsContextMenu}"
+                       IsTextSelectionEnabled="True"
                        Text="{Binding StrDateDiffResultInDays, Mode=OneWay}"
                        Visibility="{Binding IsDiffInDays, Converter={StaticResource BooleanToVisibilityNegationConverter}}"/>
         </Grid>
@@ -602,6 +604,7 @@
                        AutomationProperties.LiveSetting="Polite"
                        AutomationProperties.Name="{Binding StrDateResultAutomationName}"
                        ContextFlyout="{StaticResource ResultsContextMenu}"
+                       IsTextSelectionEnabled="True"
                        Text="{Binding StrDateResult}"/>
         </Grid>
     </Grid>

src/Calculator/Views/HistoryList.xaml

@@ -64,15 +64,19 @@
                                 ContextFlyout="{StaticResource HistoryContextMenu}">
                         <TextBlock x:Name="exprTextBlock"
                                    Margin="0,0,0,4"
+                                   HorizontalAlignment="Right"
                                    Style="{ThemeResource BodyTextBlockMediumStyle}"
                                    AutomationProperties.Name="{x:Bind AccExpression}"
+                                   IsTextSelectionEnabled="True"
                                    Text="{x:Bind Expression}"
                                    TextAlignment="Right"
                                    TextWrapping="Wrap"/>
                         <TextBlock x:Name="resultTextBlock"
+                                   HorizontalAlignment="Right"
                                    Style="{ThemeResource TitleTextBlockStyle}"
                                    FontWeight="SemiBold"
                                    AutomationProperties.Name="{x:Bind AccResult}"
+                                   IsTextSelectionEnabled="True"
                                    Text="{x:Bind Result}"
                                    TextAlignment="Right"
                                    TextWrapping="Wrap"/>

src/Calculator/Views/MemoryListItem.xaml

@@ -56,9 +56,11 @@
                 <RowDefinition Height="Auto"/>
             </Grid.RowDefinitions>
             <TextBlock Margin="0,2,14,0"
+                       HorizontalAlignment="Right"
                        Style="{ThemeResource TitleTextBlockStyle}"
                        FontWeight="SemiBold"
                        FlowDirection="LeftToRight"
+                       IsTextSelectionEnabled="True"
                        Text="{x:Bind Model.Value, Mode=OneWay}"
                        TextAlignment="Right"
                        TextReadingOrder="DetectFromContent"