Remove extra filesystem dependencies

package.json

@@ -29,12 +29,9 @@
     "hyperx": "^2.0.2",
     "languagedetect": "^1.1.1",
     "main-loop": "^3.2.0",
-    "mkdirp": "^0.5.1",
     "musicmetadata": "^2.0.2",
     "network-address": "^1.1.0",
-    "path-exists": "^2.1.0",
     "prettier-bytes": "^1.0.1",
-    "rimraf": "^2.5.2",
     "simple-get": "^2.0.0",
     "srt-to-vtt": "^1.1.1",
     "upload-element": "^1.0.1",