[Feature] Replace Java std (type-erased) generic collections comprehensively with fastUtil primitive collections.

List:
ArrayList→ IntArrayList
ArrayList→ LongArrayList
ArrayList→ DoubleArrayList
Set:
HashSet→ IntOpenHashSet
HashSet→ LongOpenHashSet
Int Key Maps:
Map→ Int2ObjectOpenHashMap
Map→ Int2IntOpenHashMap
Map→ Int2LongOpenHashMap
Map→ Int2DoubleOpenHashMap
Long Key Maps:
Map→ Long2ObjectOpenHashMap
Map→ Long2IntOpenHashMap
Map→ Long2LongOpenHashMap
Map→ Long2DoubleOpenHashMap
Object Key Maps:
Map→ Object2IntOpenHashMap
Map→ Object2LongOpenHashMap
Map→ Object2DoubleOpenHashMap