[Twitter] Skip the link if the account no longer exists or is banned

[a84r7a3rga76fg]

To avoid hitting the rate limit faster, skip the input URL if the account no longer exists or is banned. If it's protected, only get the profile picture and background if those are listed in include.

[mikf]

With the changes from 31dbbff, it will now query a user profile only once instead of for each single include item.

There will still be multiple error messages for suspended/banned accounts when using multiple includes, but only 1 rate limit token will be used.