Easy optimisations

[LordIdra]

Just some small changes which will speed things up hopefully a lot

• Changed getSuppliedFluids to return a list of pairs, not a map - a map will probably be a lot slower since we are usually only dealing with like 1-3 elements
• Changed fluid ticking code to avoid repeated BlockStorage calls for the same block and avoid filtering fluid points by type every tick - this was taking up a lot of time in spark profiles
• Fix chunk unloading causing lots of errors due to BeaconDeactivateEvent being called

[Seggan]

Have you actually profiled the first change?