Implement ABM system and damage effect

ca_effects/damage.lua

@@ -0,0 +1,17 @@
+if not regional_weather.settings.damage then return end
+
+local EFFECT_NAME = "regional_weather:damage"
+
+local function handle_effect(player_data)
+	for playername, data in pairs(player_data) do
+		local player = minetest.get_player_by_name(playername)
+		local hp = player:get_hp()
+		for weather, value in pairs(data) do
+			hp = hp - value
+		end
+		player:set_hp(hp, "weather damage")
+	end
+end
+
+climate_api.register_effect(EFFECT_NAME, handle_effect, "tick")
+climate_api.set_effect_cycle(EFFECT_NAME, climate_api.LONG_CYCLE)