Feature update: separate save-to options

[Charrr]

User can now choose to save results to local storage and/or remote server separately. Also improved usability:

• if local-save is on, the provided folder path will be verified at the start of the application, if it doesn't exist, a new folder will be created.
• if remote-save is on, the provided server uri will be verified at the start of the application.
• if neither of the save options in on, the user will be warned that the data will be lost at the start of the application.