This API adds a mana system controlled by entity attributes.
LivingEntities can have up to generic.max_mana amounts of mana. Mana is regenerated by generic.mana_regeneration every generic.mana_tick_threshold ticks.
When mana is reduced, regeneration is stopped for generic.mana_regeneration_delay_threshold ticks.
generic.reserved_mana describes the percentage amount of maximum mana that is currently not available.
When mana is <= 0, regeneration is stopped for generic.depleted_mana_regeneration_delay_threshold ticks.
When the gamerule "naturalManaRegeneration" is true, players have 1 additional mana regeneration.
The client config allows customizing the HUD element.
Casting a "LivingEntity" to the "ManaUsingEntity" interface gives access to all relevant methods.
