Updated EntityEffectMessage according to 1.12.2 protocol specification from wiki.vg
Removed updating of potion effects to clients every pulse. Duration of potion effect autimatically decreases on client. Server need to only remove it when duration time is out
Added updating of MetadataIndex.POTION_COLOR and MetadataIndex.POTION_AMBIENT metadata values on potion effect added/removed
Changes in this PR:
EntityEffectMessageaccording to 1.12.2 protocol specification from wiki.vgMetadataIndex.POTION_COLORandMetadataIndex.POTION_AMBIENTmetadata values on potion effect added/removedEffectCommand