UI - Centralized default editors registration into a service

Display conditions - Added more test operators 
Display conditions - Implemented operator selection
Display conditions - Implemented property selection and rules

src/Artemis.UI/DataModelVisualization/Display/SKColorDataModelDisplayView.xaml

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+<UserControl x:Class="Artemis.UI.DataModelVisualization.Display.SKColorDataModelDisplayView"
+             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:Artemis.UI.DataModelVisualization"
+             xmlns:converters="clr-namespace:Artemis.UI.Shared.Converters;assembly=Artemis.UI.Shared"
+             xmlns:display="clr-namespace:Artemis.UI.DataModelVisualization.Display"
+             mc:Ignorable="d"
+             d:DesignHeight="450" d:DesignWidth="800"
+             d:DataContext="{d:DesignInstance {x:Type display:SKColorDataModelDisplayViewModel}}">
+    <UserControl.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="pack://application:,,,/Artemis.UI.Shared;component/Resources/ArtemisShared.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+            <converters:ColorToStringConverter x:Key="SKColorToStringConverter" />
+            <converters:SKColorToColorConverter x:Key="SKColorToColorConverter" />
+        </ResourceDictionary>
+
+    </UserControl.Resources>
+    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
+        <TextBlock x:Name="HexDisplay"
+            Text="{Binding DisplayValue, Converter={StaticResource SKColorToStringConverter}}"
+                   VerticalAlignment="Center"
+                   HorizontalAlignment="Stretch"/>
+        <Border Width="{Binding ActualHeight, ElementName=HexDisplay}"
+                Height="{Binding ActualHeight, ElementName=HexDisplay}"
+                CornerRadius="{Binding ActualHeight, ElementName=HexDisplay}"
+                Margin="5 0 0 0"
+                VerticalAlignment="Center"
+                HorizontalAlignment="Right"
+                Background="{StaticResource Checkerboard}">
+            <Ellipse Stroke="{DynamicResource NormalBorderBrush}">
+                <Ellipse.Fill>
+                    <SolidColorBrush Color="{Binding DisplayValue, Converter={StaticResource SKColorToColorConverter}}" />
+                </Ellipse.Fill>
+            </Ellipse>
+        </Border>
+    </StackPanel>
+</UserControl>

src/Artemis.UI/DataModelVisualization/Display/SKColorDataModelDisplayViewModel.cs

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+using Artemis.UI.Shared.DataModelVisualization;
+using SkiaSharp;
+
+namespace Artemis.UI.DataModelVisualization.Display
+{
+    public class SKColorDataModelDisplayViewModel : DataModelDisplayViewModel<SKColor>
+    {
+    }
+}