Update prettier-all script

Also exclude files with extensions that are usually large. Reduces the
format time by approximately 4 seconds.

.prettierignore

@@ -0,0 +1,7 @@
+*.gif
+*.jpg
+*.mp3
+*.png
+*.wav
+*.webm
+*.woff2

package.json

@@ -10,7 +10,7 @@
     "scripts": {
         "gulp": "gulp --cwd gulp",
         "lint": "(eslint . && tsc && tsc -p src) || (tsc && tsc -p src) || tsc -p src",
-        "prettier-all": "prettier --write src/**/*.* && prettier --write gulp/**/*.*",
+        "prettier-all": "prettier --write .",
         "buildTypes": "tsc src/js/application.js --declaration --allowJs --emitDeclarationOnly --skipLibCheck --out types.js",
         "package-win32-x64": "gulp --cwd gulp package.standalone.win32-x64",
         "package-win32-arm64": "gulp --cwd gulp package.standalone.win32-arm64",