Add a Server Events Tab Toggle

Most of the servers that I'm in don't need or use any events, yet the Events tab is front and center in the channel list for all users that have admin permissions in those servers. There should be an option to hide the Events tab, especially when there are no scheduled events.

This feature should behave the same way as the Boost Progress Bar for servers, where you can simply toggle it off in the server settings or by right clicking its tab in the server.