Add setting to hide discord invite message

[BannZay]

I really appreciate the effort that you put in it. Addon is really good.

But I am suggesting to add an option to hide login message (but keep it turned on by default).

The problem is that a lot of addons writes something in chat on login so it is considered as spam at some point when you have too many addons.

P.s.: would be also great to have an ability to copy/paste the link without the help of additional chat addons.

[BannZay]

I could try to implement it by myself if you liked the idea and needs help.