Implemented layer LED assignment

Added a centralised ProfileEditorSurface for communication between VMs
Prefixed Surface, Device and Led with Artemis to differentiate them better

src/Artemis.UI/Screens/Module/ProfileEditor/ProfileTree/ProfileTreeView.xaml

@@ -0,0 +1,67 @@
+<UserControl x:Class="Artemis.UI.Screens.Module.ProfileEditor.ProfileTree.ProfileTreeView"
+             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:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
+             xmlns:s="https://github.com/canton7/Stylet"
+             xmlns:dd="urn:gong-wpf-dragdrop"
+             xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
+             xmlns:utilities="clr-namespace:Artemis.UI.Utilities"
+             xmlns:profileTree="clr-namespace:Artemis.UI.Screens.Module.ProfileEditor.ProfileTree"
+             xmlns:treeItem="clr-namespace:Artemis.UI.Screens.Module.ProfileEditor.ProfileTree.TreeItem"
+             mc:Ignorable="d"
+             d:DesignHeight="450" d:DesignWidth="800"
+             d:DataContext="{d:DesignInstance {x:Type profileTree:ProfileTreeViewModel}}">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+        <StackPanel>
+            <TextBlock Style="{StaticResource MaterialDesignSubheadingTextBlock}" Margin="10 5 0 -4">
+                Profile elements
+            </TextBlock>
+            <Separator Style="{StaticResource MaterialDesignDarkSeparator}" Margin="8 0" />
+        </StackPanel>
+        
+        <TreeView Grid.Row="1"
+                  ItemsSource="{Binding RootFolder.Children}"
+                  HorizontalContentAlignment="Stretch"
+                  dd:DragDrop.IsDragSource="True"
+                  dd:DragDrop.IsDropTarget="True"
+                  dd:DragDrop.DropHandler="{Binding}">
+            <i:Interaction.Behaviors>
+                <utilities:BindableSelectedItemBehavior SelectedItem="{Binding SelectedTreeItem, Mode=TwoWay}" />
+            </i:Interaction.Behaviors>
+            <TreeView.Resources>
+                <HierarchicalDataTemplate DataType="{x:Type treeItem:FolderViewModel}" ItemsSource="{Binding Children}">
+                    <ContentControl s:View.Model="{Binding}" />
+                </HierarchicalDataTemplate>
+                <HierarchicalDataTemplate DataType="{x:Type treeItem:LayerViewModel}" ItemsSource="{Binding Children}">
+                    <ContentControl s:View.Model="{Binding}" />
+                </HierarchicalDataTemplate>
+            </TreeView.Resources>
+        </TreeView>
+
+        <StackPanel HorizontalAlignment="Right" Grid.Row="2" Orientation="Horizontal" Margin="8">
+            <Button Style="{StaticResource MaterialDesignToolButton}"
+                    Width="30"
+                    Padding="2 0 2 0"
+                    materialDesign:RippleAssist.IsCentered="True"
+                    ToolTip="Add new folder to root"
+                    Command="{s:Action AddFolder}">
+                <materialDesign:PackIcon Kind="CreateNewFolder" />
+            </Button>
+            <Button Style="{StaticResource MaterialDesignToolButton}"
+                    Width="30"
+                    Padding="2 0 2 0"
+                    materialDesign:RippleAssist.IsCentered="True"
+                    ToolTip="Add new layer to root"
+                    Command="{s:Action AddLayer}">
+                <materialDesign:PackIcon Kind="LayersPlus" />
+            </Button>
+        </StackPanel>
+    </Grid>
+</UserControl>