Timeline - Added segment time input

Timeline - Ensure segments can't get too short, prevent removing all segments

src/Artemis.UI/Screens/ProfileEditor/Panels/Properties/Dialogs/TimelineSegmentEditView.axaml

@@ -0,0 +1,18 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:controls="clr-namespace:FluentAvalonia.UI.Controls;assembly=FluentAvalonia"
+             xmlns:dialogs="clr-namespace:Artemis.UI.Screens.ProfileEditor.Properties.Dialogs"
+             xmlns:attachedProperties="clr-namespace:Artemis.UI.Shared.AttachedProperties;assembly=Artemis.UI.Shared"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Artemis.UI.Screens.ProfileEditor.Properties.Dialogs.TimelineSegmentEditView"
+             x:DataType="dialogs:TimelineSegmentEditViewModel">
+    <StackPanel>
+        <controls:NumberBox Name="LengthNumberBox" 
+                            Minimum="0.1" 
+                            Value="{CompiledBinding SegmentLength}"
+                            HorizontalAlignment="Stretch" 
+                            attachedProperties:NumberBoxAssist.SuffixText="sec"/>    
+    </StackPanel>
+</UserControl>

src/Artemis.UI/Screens/ProfileEditor/Panels/Properties/Dialogs/TimelineSegmentEditView.axaml.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
+
+namespace Artemis.UI.Screens.ProfileEditor.Properties.Dialogs;
+
+public partial class TimelineSegmentEditView : ReactiveUserControl<TimelineSegmentEditViewModel>
+{
+    public TimelineSegmentEditView()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/Artemis.UI/Screens/ProfileEditor/Panels/Properties/Dialogs/TimelineSegmentEditViewModel.cs

@@ -0,0 +1,20 @@
+using System;
+using Artemis.UI.Shared;
+
+namespace Artemis.UI.Screens.ProfileEditor.Properties.Dialogs;
+
+public class TimelineSegmentEditViewModel : ContentDialogViewModelBase
+{
+    private double _segmentLength;
+
+    public TimelineSegmentEditViewModel(TimeSpan segmentLength)
+    {
+        SegmentLength = segmentLength.TotalSeconds;
+    }
+
+    public double SegmentLength
+    {
+        get => _segmentLength;
+        set => _segmentLength = value;
+    }
+}