Merge pull request #397 from irihitech/date

Introduce DateTimePicker

demo/Ursa.Demo/Pages/DateTimePickerDemo.axaml

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+<UserControl
+    x:Class="Ursa.Demo.Pages.DateTimePickerDemo"
+    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:u="https://irihi.tech/ursa"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    mc:Ignorable="d">
+    <StackPanel
+        Margin="20"
+        HorizontalAlignment="Left"
+        Spacing="20">
+        <u:Form>
+            <TextBox
+                u:FormItem.Label="DisplayFormat"
+                Name="formatBox"
+                Width="300"
+                Text="yyyy年MM月dd日 HH时mm分ss秒" />
+            <TextBox Name="panelBox" u:FormItem.Label="Panel" Text="hh mm ss" />
+            <u:DateTimePicker
+                MinWidth="100"
+                u:FormItem.NoLabel="True"
+                Classes="ClearButton"
+                DisplayFormat="{Binding #formatBox.Text}"
+                PanelFormat="{Binding #panelBox.Text}" />
+        </u:Form>
+    </StackPanel>
+</UserControl>

demo/Ursa.Demo/Pages/DateTimePickerDemo.axaml.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Ursa.Demo.Pages;
+
+public partial class DateTimePickerDemo : UserControl
+{
+    public DateTimePickerDemo()
+    {
+        InitializeComponent();
+    }
+}