[Feature] Regenerate Scene Assets after Merging

[smegmarip]

Is your feature request related to a problem? Please describe.
Currently, I have to manually regenerate a merged scene's sprites and markers after merging.

Describe the solution you'd like
It would be great if all assets invalidated by merging could be automatically regenerated.

Describe alternatives you've considered
I considered writing a plugin to automate this feature, but it seems like it should a natural post-process action after a successful merge.