Remove control characters from filesystem paths

- add 'path-remove' option to specify the set of characters that
 should be removed
- rename 'restrict-filenames' to 'path-restrict'
- #348, #380

docs/gallery-dl.conf

@@ -8,8 +8,9 @@
         "proxy": null,
         "skip": true,
         "sleep": 0,
+        "path-restrict": "auto",
+        "path-remove": "\\u0000-\\u001f\\u007f",
         "user-agent": "Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0",
-        "restrict-filenames": "auto",
 
         "artstation":
         {