Moved media files and introduced IImageDimensionExtractor and to avoid System.drawing in core

src/Umbraco.Core/Media/Exif/ImageFileFormat.cs

@@ -0,0 +1,25 @@
+namespace Umbraco.Web.Media.Exif
+{
+    /// <summary>
+    /// Represents the format of the <see cref="ImageFile"/>.
+    /// </summary>
+    internal enum ImageFileFormat
+    {
+        /// <summary>
+        /// The file is not recognized.
+        /// </summary>
+        Unknown,
+        /// <summary>
+        /// The file is a JPEG/Exif or JPEG/JFIF file.
+        /// </summary>
+        JPEG,
+        /// <summary>
+        /// The file is a TIFF File.
+        /// </summary>
+        TIFF,
+        /// <summary>
+        /// The file is a SVG File.
+        /// </summary>
+        SVG,
+    }
+}