Mostly about save persistence

[matthewyang204]

Changes:

• Make the editor capable of remembering the filepath so it can automatically save to the file location rather than just sitting there and asking user to replace file and such
• Make a better icon (current icon is too tiny and likely a copyrighted image anyway)
• Add a save as function to allow the file to be saved to a different filepath if user wants
• Add proper font detection across platforms
• Stop the program from leaking sensitive user content to stdout
• Bump some requirements to their latest versions

Please see that you are ok with the changes; otherwise, feel free to merge.