Extending `PersistentState` is not safe

[jac3km4]

• save files with custom data from PersistentState can't be loaded after removing the change
• consider disallowing extending the PersistentState class

[psiberx]

just in case: this only applies to persistent properties, but there is no issue with extending methods and other properties

[TheMindVirus]

Even without the PersistentState class there is persistent caching behaviour which makes this mod high risk due to difficulty of uninstallation without breaking other mods. I have recently had to verify integrity on Steam because redscripts have persisted in cache when the scripts have been disabled and written out. There is additionally no way to see the tree to prune it for the methods to remove and re-wrapping methods does not work. As it stands this is causing serious impact to related platforms.