Added commands to add or remove mobs from blacklist.

/spf addmob [ENTITY_TYPE]

/spf removemob [ENTITY_TYPE]


Any changes made via these commands are automatically saved in config.yml


Known issues:
The addmob command cant recognize if the mon you are adding is a valid mob or not.
If you have multiple instances of the same mob in config.yml the removemob command will only remove it once.

Fixed an issue where having multiple blacklisted mobs would render blacklist ineffective

Added "enable-blacklist" function that allows to blacklist specific mobs from being despawn-protected by the plugin. You can turn off blacklist or edit which mobs are excluded from despawn protection in plugin's config.yml file