Option to aut-copy NPC dialog + System messages to clipboard

[akiduki18]

This allows one to use tataru helper with clipboard-parsing dictionaries like yomichan to use it as a study tool. I understand this can be outside of the scope of the app so feel free to close this PR. I asked in discord about a week ago but got no reply.

I also had to update to .net 4.8 because I could not find some of the old ones that were required and didn't have much time to deal with that. Apologies.