Added a placeholder gui in the starter menu explaining every placeholder and how to use it.
Added a new PlaceHolder: %cbossestimer_OWNER_MODID_TYPE_THREAD%
This placeholders shows a timer for when the next mob will spawn. There is no need to explain in detail here as in the placeholder GUI everything is explained. Just worth to mention that it only works on Holograms (DecentHolograms to be exact) so its not perticularly useful to most people. But im planning on changing that in the near future.
Also fixed some bugs with the despawn timer. Things like mobs not spawning because the mob caps were not changed after despawn etc. All should be fixed (I hope).