Ommoran Extraction: Gem Defense

Tweaked spawning of waves - timed waves are 50% less frequent (30 seconds -> 60 seconds), depth based waves are 33% more frequent (30 depth -> 20 depth), anti-cheese is every 60 seconds instead of 30 seconds Overall, less waves should spawn

Made mobs and rewards data-configurable: will upload base datapack as its own project soon!