Fancier fire effects

- Add ignite sound.
- Use new fire_burst node if available, for more
  predictable flame duration.

rules.lua

@@ -217,6 +217,11 @@ local function territory_search(pos, max)
     )
 end
 
+local firenode = "nc_fire:fire_burst"
+if not minetest.registered_nodes["nc_fire:fire_burst"] then
+	firenode = "nc_fire:fire"
+end
+
 function lc_liberties.handle_placement(pos)
     cache = {}
     --minetest.chat_send_all(tostring(pos))
@@ -264,7 +269,8 @@ function lc_liberties.handle_placement(pos)
                 for i2, v2 in pairs(v.stones) do
                     local under = check_position(v2 + down)
                     if (under:sub(1, 1) == "W") and (under:len() > 1) then
-                        nodecore.set_loud(v2, {name = "nc_fire:fire"})
+			nodecore.sound_play("nc_fire_ignite", {gain = 1, pos = pos})
+                        nodecore.set_loud(v2, {name = firenode})
                     else
                         nodecore.set_loud(v2, {name = "air"})
                     end