functions of watcher

[cheap57]

• [x] detect save change
• [ ] recognize/suggest session
• [x] melt & parse in json
• [ ] extract & sort needed data in dataframe
• [ ] save dataframes in correct session folder (game/session)

[cheap57]

support for games

• [ ] imperator
• [ ] ck3
• [ ] eu4
• [ ] Vic3
• [ ] HOI4