Sponsor Upgrade Additions

[anthony]

With the reimplementation of AI here, I am giving site sponsors two additional features:

1. AI bot control - Enable/disable AI bots on own posts.
2. AI unlimited - Unlimited access to AI use.

As we have a global AI bot, sponsors can enable or disable AI bot use in their own posts from the post tools menu in the top right of their posts only. This can also be done on the master post creation screen, not the quick one.