v1.11

• Changed banner to include warning and author information.
• Added a new function to check if a variable exists.
• Better checks for existing variables.
• Variables laid out better using script scope.
• File selection will now only accept integers and only those for files that it has checked already exist.
• Now checks if the edited files output location exists, if it doesn't then it creates the folder.
• Checks if ffmpeg.exe exists in the right location, if not then exit with an error.
• Reformatted ffmpeg commands so they adhere to best practices.
• Fixed bug where option 10 was hardcoded to a set location.
• Tidied up version history formatting.