tests: Add a visual test for fractional blur strength

tests/tests/swfs/visual/filters/blur_fractional/Test.as

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+package  {
+	
+import flash.display.Bitmap;
+import flash.geom.Point;
+import flash.display.BitmapData;
+import flash.geom.Rectangle;
+import flash.display.MovieClip;
+import flash.filters.BlurFilter;
+
+public class Test extends MovieClip {
+	public function Test() {
+		for (var col = 0; col < 10; col += 1) {
+			for (var row = 0; row < 10; row += 1) {
+				var image  : BitmapData = new Image();
+				
+				var filter = new BlurFilter(row + col * 0.1, 1, 1);
+				image.applyFilter(image, new Rectangle(0, 0, 80, 80), new Point(0, 0), filter);
+				
+				var bm = new Bitmap(image);
+				bm.smoothing = false;
+				bm.y = row * 80;
+				bm.x = col * 80;
+				addChild(bm);
+			}
+		}
+	}
+}
+
+}

tests/tests/swfs/visual/filters/blur_fractional/test.toml

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+num_frames = 1
+
+[image_comparison]
+tolerance = 5
+
+[player_options]
+with_renderer = { optional = false, sample_count = 1, exclude_warp = true }