Add variable 'sneaker.spawn_cap':

Will set maximun number of sneakers that can be spawned in world at one
time.

init.lua

@@ -9,6 +9,8 @@ function sneaker.log(message)
 	minetest.log("action", "[" .. sneaker.modname .. "] " .. message)
 end
 
+sneaker.spawn_cap = tonumber(minetest.settings:get("sneaker_spawn_cap")) or 50
+
 local scripts = {
 	"tnt_function",
 	"spawn",