Fix screenshotHandler and re-introduce some unwillingly deleted improvements

package.json

@@ -26,6 +26,7 @@
     "css-mq-parser": "0.0.3",
     "debug": "4.3.4",
     "easyxml": "2.0.1",
+    "file-type": "16.5.3",
     "fontkit": "2.0.2",
     "html-minifier": "4.0.0",
     "image-size": "1.0.2",
@@ -34,18 +35,8 @@
     "imagemin-jpegtran": "7.0.0",
     "imagemin-optipng": "8.0.0",
     "imagemin-svgo": "9.0.0",
-    "is-eot": "1.0.0",
-    "is-gif": "3.0.0",
-    "is-jpg": "2.0.0",
     "is-json": "2.0.1",
-    "is-otf": "0.1.2",
-    "is-png": "1.1.0",
     "is-svg": "3.0.0",
-    "is-ttf": "0.2.2",
-    "is-webp": "1.0.1",
-    "is-woff": "1.0.3",
-    "is-woff2": "1.0.0",
-    "jimp": "0.22.8",
     "md5": "2.3.0",
     "meow": "5.0.0",
     "parse-color": "1.0.0",