Allow limited spawner placement for factions without a core

Completely banning a faction from using spawners without placing a core has several bad side effects. - Encourages early core placement, especially among players who aren’t informed - Pisses players off when they can’t use spawners without a dangerous core - Requires another explanation of another way in which a player can get screwed over, driving them away from the server Allow factions to place a limited number of spawners with no core, and make this more clear throughout the server. This limitation is not advertised clearly, and neither is the true extent of the risk of the core. Either allow a flat number of spawners, or X number of spawners per faction member. This would balance the system, give smaller factions something to do without marking themselves for destruction, and prevent outright restricting players from one of the most important aspects of Minecraft survival servers.