fix some analyzer complaints on var

Author: antonfirsov

src/ImageSharp.Drawing/Processing/DrawingOptionsDefaultsExtensions.cs

@@ -55,7 +55,7 @@ public static Matrix3x2 GetDrawingTransform(this IImageProcessingContext context
                 return go;
             }
 
-            var matrix = context.Configuration.GetDrawingTransform();
+            Matrix3x2 matrix = context.Configuration.GetDrawingTransform();
 
             // do not cache the fall back to config into the processing context
             // in case someone want to change the value on the config and expects it re-flow thru.

src/ImageSharp.Drawing/Processing/Extensions/ClearPathExtensions.cs

@@ -18,7 +18,7 @@ public static class ClearPathExtensions
         /// <returns>A clone of shapeOptions with ColorBlendingMode, AlphaCompositionMode, and BlendPercentage set</returns>
         internal static DrawingOptions CloneForClearOperation(this DrawingOptions shapeOptions)
         {
-            var options = shapeOptions.GraphicsOptions.DeepClone();
+            GraphicsOptions options = shapeOptions.GraphicsOptions.DeepClone();
             options.ColorBlendingMode = PixelFormats.PixelColorBlendingMode.Normal;
             options.AlphaCompositionMode = PixelFormats.PixelAlphaCompositionMode.Src;
             options.BlendPercentage = 1;

src/ImageSharp.Drawing/Processing/Processors/Drawing/FillPathProcessor.cs

@@ -45,7 +45,7 @@ public FillPathProcessor(DrawingOptions options, IBrush brush, IPath shape)
         public IImageProcessor<TPixel> CreatePixelSpecificProcessor<TPixel>(Configuration configuration, Image<TPixel> source, Rectangle sourceRectangle)
             where TPixel : unmanaged, IPixel<TPixel>
         {
-            var shape = this.Shape.Transform(this.Options.Transform);
+            IPath shape = this.Shape.Transform(this.Options.Transform);
 
             if (shape is RectangularPolygon rectPoly)
             {

src/ImageSharp.Drawing/Processing/Processors/Text/DrawTextProcessor{TPixel}.cs

@@ -377,7 +377,7 @@ public void EndGlyph()
 
             private Buffer2D<float> Render(IPath path)
             {
-                var size = Rectangle.Ceiling(new RectangularPolygon(path.Bounds)
+                Size size = Rectangle.Ceiling(new RectangularPolygon(path.Bounds)
                             .Transform(this.Options.Transform)
                             .Bounds)
                             .Size;