Is your feature request related to a problem? Please describe.
When uninstalling the shrines mod, the game keeps spamming the log with Unknown structure start: shrines:balloon for example. That really annoying

Describe the solution you'd like
There could be a command to run before uninstalling the mod, that removes all references to shrines structures (and other mods if possible)

Describe alternatives you've considered
An other option could have been, that the mod automatically removes all references, but that isn't possible, because the references are necessary as long as the mod is installed
Also just stop spamming no matter if there are structure references would be a solution, but that's out of context as changes of this mod does only apply as long as the mod is on

Additional context
See #13