* Create TurfSystem equivalent for and obsolete TurfHelpers.GetTileRef
* Fix EntitySystem uses of TurfHelpers.GetTileRef
* Fix EntitySystem uses of TurfHelpers.TryGetTileRef
* Fix construction condition uses of TurfHelpers.GetTileRef
* Fix last use of TurfHelpers.IsBlockedTurf
* Create TurfSystem equivalent to and obsolete TurfHelpers.GetContentTileDefinition
* Fix uses of TurfHelpers.GetContentTileDefinition(TileRef)
* Fix uses of TurfHelpers.GetContentTileDefinition(Tile)
* Create TurfSystem equivalent to and obsolete TurfHelpers.IsSpace
* Fix EntitySystem uses of TurfHelpers.IsSpace(Tile)
* Fix EntitySystem uses of TurfHelpers.IsSpace(TileRef)
* Fix remaining uses of TurfHelpers.IsSpace
* Fix uses of TurfHelpers.GetEntitiesInTile
* Delete TurfHelpers.cs
* Add GetEntitiesInTile lookup methods
* Convert some GetEntitiesInTile methods to LookupSystem extension methods
* Use new GetEntitiesInTile methods
* Recycle spiderweb hashset
* Recycle floor tile hashset
* Move entity effects to shared
* relocate spawning to server
* Generic version of EntityEffect for just raising event.
* genericise everything
* oops forgot to push you
* some condensation
* finish rebas
* unwhite the space
* oops forgot nuke
* bad rebase fix
* useless annotations begone
---------
Co-authored-by: EmoGarbage404 <retron404@gmail.com>
