Lift Limits for roles on threads.

Currently, any role that has >100 people cannot be tagged in a thread. Also, only 1000 members can see a thread at any time. 

These are just arbitrary, outrageous numbers to limit for servers, and it hinders larger servers from using these features. We need these limits lifted to interact with members.

We tried using forums, and forum posts are just threads as well. We want everyone to be able to participate, and in a server of 20,000 members limiting to 100 members per role and 1000 members total in a thread is way too low.