Fix Slides F+, Add multi err code support

Error codes module expanded to support arrays of error codes rather than only one.
Using this new functionality, Slides was set to error codes 404 (as standard) AND 204 (non standard), to accomodate for that website's odd edge case.

sherlock/resources/data.json

@@ -1757,6 +1757,7 @@
     "username_claimed": "blue"
   },
   "Slides": {
+    "errorCode": [204, 404],
     "errorType": "status_code",
     "url": "https://slides.com/{}",
     "urlMain": "https://slides.com/",

sherlock/sherlock.py

@@ -351,7 +351,6 @@ def sherlock(
 
         # Get the expected error type
         error_type = net_info["errorType"]
-        error_code = net_info.get("errorCode")
 
         # Retrieve future and ensure it has finished
         future = net_info["request_future"]
@@ -407,14 +406,19 @@ def sherlock(
             else:
                 query_status = QueryStatus.AVAILABLE
         elif error_type == "status_code":
-            # Checks if the Status Code is equal to the optional "errorCode" given in 'data.json'
-            if error_code == r.status_code:
-                query_status = QueryStatus.AVAILABLE
+            query_status = QueryStatus.AVAILABLE
+            error_codes = net_info.get("errorCode")
+
+            if error_codes: # (if set in data.json)
+                if isinstance(error_codes, int):
+                    if error_codes != r.status_code:
+                        query_status = QueryStatus.CLAIMED
+                else:
+                    if r.status_code not in error_codes:
+                        query_status = QueryStatus.CLAIMED
             # Checks if the status code of the response is 2XX
             elif not r.status_code >= 300 or r.status_code < 200:
                 query_status = QueryStatus.CLAIMED
-            else:
-                query_status = QueryStatus.AVAILABLE
         elif error_type == "response_url":
             # For this detection method, we have turned off the redirect.
             # So, there is no need to check the response URL: it will always