Area cache

[QuinnBast]

Use a cache when events are triggered to be able to lookup the events faster within a hashmap. See https://github.com/EngineHub/WorldGuard/blob/af93530dbe9f420be20aa490d33c3fafb997aa0d/worldguard-core/src/main/java/com/sk89q/worldguard/protection/regions/QueryCache.java

Create a custom "CacheKey" to be used as the key which stores the polygon and can then check if the location in question is contained. Can use a priorty queue based on how many times the location has been 'hit' with events in a period of time.

https://leetcode.com/problems/top-k-frequent-words/discuss/108346/My-simple-Java-solution-using-HashMap-and-PriorityQueue-O(nlogk)-time-and-O(n)-space/119001