Fixed a few more broken saves and text generation speed

Attempted to fix a rare occurrence in which your current location would be marked as a parent of itself which would break the save. For saves that were broken in this way, the parent location info was lost, so my workaround was to set it as a detached location in the player's first universe. If you were affected by this issue, use `opopen 1` to describe the place being somewhere in the world, then use the map UI to move it to where you want.

If your save is still broken, please report it in the Discord or Steam forums

Fixed bug in client-side logic limiting parallelization for all text gen, which would cause slow-downs only when background tasks were queued.