修改了logwindows输出，避免高频输出时卡死。修改了流程运行上下文，使节点具备终止分支运行的能力。

WorkBench.Remote/Node/View/ExpOpNodeControl.xaml

@@ -0,0 +1,19 @@
+<local:NodeControlBase x:Class="Serein.WorkBench.Node.View.ExpOpNodeControl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             xmlns:local="clr-namespace:Serein.WorkBench.Node.View"
+                       MaxWidth="300">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+        <!--<TextBlock Grid.Row="0" Text=""></TextBlock>-->
+
+        <StackPanel Grid.Row="0" Orientation="Vertical" Background="LightSteelBlue">
+            <TextBlock Grid.Row="2" Text="表达式"></TextBlock>
+            <TextBox Text="{Binding Expression, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Stretch"></TextBox>
+        </StackPanel>
+    </Grid>
+</local:NodeControlBase>