Added an optional dependency on TitleAPI. If you have it installed, CarbonSleep uses it instead of Spigots sendTitle method, which should fix the flickering titles.

I've also added a per-world use-titles option to config.yml - This will be added to the config when this version initializes, defaults to true. This is mostly so you can disable titles entirely if they're flickering for you and you don't want to use TitleAPI.

I've tested this on my server running Spigot 1.11.2 and it seems to work both with and without TitleAPI. If ya have issues, be sure to hit up the discussion.