Consolidate ABMs

Spread ABM intervals evenly across 1 to 16 seconds
16s ensures no nodes are missed when player walks past
Adjust chance values to compensate, for identical action rates
Combine lavacooling ABMs into one, return to chance = 1
Grass growth: add 'neighbors = "air"' to avoid
processing the thousands of underground dirt nodes
Grass death: Reduce action rate to that of grass growth
Fire: Use chance = 1 for flame extinguishing
and flame removal when mod is disabled

mods/flowers/init.lua

@@ -76,8 +76,8 @@ end
 minetest.register_abm({
 	nodenames = {"group:flora"},
 	neighbors = {"default:dirt_with_grass", "default:desert_sand"},
-	interval = 50,
-	chance = 25,
+	interval = 13,
+	chance = 96,
 	action = function(pos, node)
 		pos.y = pos.y - 1
 		local under = minetest.get_node(pos)