Put some messages back when not using the "silent" option.

Most noteably cooldown messages, also add a throttle.
Add a special-case message for times of 1 second or lower.
Add a special check for something that shouldn't happen, but seems to.
Health regeneration should use player's max health.
Extinguish flames if the wand has fire protection.
add break_blocks parameter to BoomSpell.
Add speed parameter to levitate spell
Allow adding non-buildable materials to wands.
Add configurable destructible/indestructible block lists.
Allow altering entities.