Various fixes, use upload by date-time and added a limit to auto-tagger.

[ItsKaa]

Couple of improvements and some fixes for crashes that I found.

• Handling various exceptions:
  • pixiv_tags was defined inside a try-except but was also used outside of it causing in a consistent crash of a url I cannot remember.
  • unhandled extensions: handled the general error under not post_id because the return value was incorrect and also excluded some extra extensions.
  • JSONDecodeError, I believe the name couldn't be found or some other element, best to not crash because of it.
• Fixed tag sanitization not always being consistent.
• Added a limit to the auto-tagger, there's an underlying problem where it seems to take up too many file handles, I haven't really find the cause and it only happens when dealing with a lot of files, a limit of 1000 works fine for me. Also might help some people out dealing with API limits.
• Uploading files based on the file date, either from the metadata or the modified date (for accurate dates, it will require setting this up in the gallery-dl config file). I enjoy having things uploaded in order, especially when doing a bulk import.