Fix: 1. QuickShop permission checking manager not check anything. 2. QuickShop SimpleEventManager won't continue check other events if this plugin's a listener returned not matched the filter
Optimize: 1. Async SQL tasks
Add: 1. A option can let user use Bukkit event manager not QuickShop SimpleEventManager (If quickshop not correcrtlly detect your protection plugin, set shop.use-protection-checking-filter to true)