Optimize hashtable loading

[Morilli]

Just a bit of free optimization for the hashtable loading, as that does take a significant amount of time, mainly loading hashes.game.txt.

In my basic testing, this reduces loading time of the hashes.game.txt file from ~1.5s to ~1.2s, while also reducing total memory allocations from ~920MB to ~600MB.

I've used two different methods here, a more readable and simple and slightly less optimal for bin hashtable loading, and a more optimized one for game/lcu hashtable loading.