Added PowerPoint templates to the Slide Assistant (#1055)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/PowerPoint/TemplateSlideElementKind.cs

@@ -0,0 +1,41 @@
+namespace AIStudio.Tools.PowerPoint;
+
+/// <summary>
+/// What kind of element a slide of a template carries besides the placeholders of its layout.
+/// </summary>
+internal enum TemplateSlideElementKind
+{
+    /// <summary>
+    /// A shape with text, e.g., a text box naming the source of a picture.
+    /// </summary>
+    TEXT_BOX,
+
+    /// <summary>
+    /// A shape without text which shows something all the same, e.g., a colored rectangle.
+    /// </summary>
+    SHAPE,
+
+    /// <summary>
+    /// A line or a connector.
+    /// </summary>
+    LINE,
+
+    PICTURE,
+    TABLE,
+    CHART,
+
+    /// <summary>
+    /// A SmartArt graphic.
+    /// </summary>
+    DIAGRAM,
+
+    /// <summary>
+    /// Anything else, e.g., an embedded object, a video, or an equation.
+    /// </summary>
+    OBJECT,
+
+    /// <summary>
+    /// Shapes grouped into one, which count as one element.
+    /// </summary>
+    GROUP,
+}