Custom Backup Tool v1.2

Changelog:

1. Multiple folders can be backed up now.
2. The date & time after the backup folder names feature can be enabled/disabled by editing the dirs.txt file.
   This was done to assure weekly/monthly backups don't pile up, and can instead have one backup overwrite most of its files continuously.
3. Message box results are fixed. Before, the minutes would actually display the seconds, and the seconds could be greater than 60.
4. The errors.log file will no longer delete & remake itself each time it finds an exception.
   Instead, all the exceptions stack up, and each one includes the date & time during which it occured.
5. Unlikely to happen, but if the user provides the same directory as both the input/source and output/destination, the backup method will return/terminate early.
   To prevent this from happening anyway, the user must assure the backup folder has NOTHING to do with the input directories.
   It needs to be stored separately, which means it cannot be a subfolder of any input directory.