project: reorganize the structure of the project.

* remove dotnet-tool.json because the project does not rely on any dotnet tools.
* remove Directory.Build.props because the solution has only one project.
* move src/SourceGit to src. It's not needed to put all sources into a subfolder of src since there's only one project.

src/Views/CommitDetail.axaml

@@ -0,0 +1,76 @@
+<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:m="using:SourceGit.Models"
+             xmlns:vm="using:SourceGit.ViewModels"
+             xmlns:v="using:SourceGit.Views"
+             xmlns:c="using:SourceGit.Converters"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="SourceGit.Views.CommitDetail"
+             x:DataType="vm:CommitDetail"
+             Background="{DynamicResource Brush.Window}">
+  <TabControl SelectedIndex="{Binding ActivePageIndex, Mode=TwoWay}" Padding="4">
+    <!-- Information Page -->
+    <TabItem>
+      <TabItem.Header>
+        <TextBlock Classes="tab_header" Text="{DynamicResource Text.CommitDetail.Info}"/>
+      </TabItem.Header>
+
+      <Grid RowDefinitions="Auto,*">
+        <!-- Base Information -->
+        <v:CommitBaseInfo Grid.Row="0" Content="{Binding Commit}"/>
+
+        <!-- Change List -->
+        <DataGrid Grid.Row="1"
+                  Background="Transparent"
+                  ItemsSource="{Binding Changes}"
+                  SelectionMode="Single"
+                  CanUserReorderColumns="False"
+                  CanUserResizeColumns="False"
+                  CanUserSortColumns="False"
+                  IsReadOnly="True"
+                  HeadersVisibility="None"
+                  Focusable="False"
+                  RowHeight="26"
+                  Margin="80,0,8,0"
+                  HorizontalScrollBarVisibility="Disabled"
+                  VerticalScrollBarVisibility="Auto"
+                  ContextRequested="OnChangeListContextRequested"
+                  DoubleTapped="OnChangeListDoubleTapped">
+          <DataGrid.Columns>
+            <DataGridTemplateColumn Header="ICON">
+              <DataGridTemplateColumn.CellTemplate>
+                <DataTemplate>
+                  <v:ChangeStatusIcon Width="14" Height="14" IsWorkingCopyChange="False" Change="{Binding}"/>
+                </DataTemplate>
+              </DataGridTemplateColumn.CellTemplate>
+            </DataGridTemplateColumn>
+
+            <DataGridTemplateColumn Width="*" Header="PATH">
+              <DataGridTemplateColumn.CellTemplate>
+                <DataTemplate>
+                  <TextBlock Classes="monospace" Text="{Binding Path}" Margin="8,0,0,0"/>
+                </DataTemplate>
+              </DataGridTemplateColumn.CellTemplate>
+            </DataGridTemplateColumn>
+          </DataGrid.Columns>
+        </DataGrid>
+      </Grid>
+    </TabItem>
+
+    <TabItem>
+      <TabItem.Header>
+        <TextBlock Classes="tab_header" Text="{DynamicResource Text.CommitDetail.Changes}"/>
+      </TabItem.Header>
+      <v:CommitChanges/>
+    </TabItem>
+
+    <TabItem>
+      <TabItem.Header>
+        <TextBlock Classes="tab_header" Text="{DynamicResource Text.CommitDetail.Files}"/>
+      </TabItem.Header>
+      <v:RevisionFiles/>
+    </TabItem>
+  </TabControl>
+</UserControl>