Hotfix: Saves lost when disk full

This fixes savegames being lost when there's no disk space available to write them. With the fix, if there's no disk space available, the existing save is untouched. Also, saves are now backed up locally (not synced to Steam Cloud) to protect against other potential future issues that may cause the save file to be corrupted or deleted.

I apologize to those affected by the bug. While I cannot recover the lost saves, I can recreate an approximation - please contact me on Discord, Steam Discussions, or through email if you'd like me to do that for you.

The update also fixes a rare soft lock when pacifying a haunting triggers a relic that tries to interact with the haunting or pacify it again.