v2.4.0 -- Some reworks to processing

What's Changed

• Turf processing no longer rayon::spawns into another thread, this is to make sure that nothing in byond can interfere with it, as katmos is having issues.
• Timing operations now uses coarsetime instead of the std timer for less of a performance penalty
• Hashmap/Hashsets now uses hashbrown's implementation for a bit of a performance
• Gas arena allocations are now in the main thread instead of getting rayon::spawn'd
• Some other stuffs

Full Changelog: v2.3.0...v2.4.0