- "type" option now takes in an MM item.
- Minor cleanup

- Item serialization, storage, & additional options
- Added initial implementation of item serialization and storage.
- Added "interactable" option, allows for users to set which slots can be interacted with.
- Added "save" option, allows for users to set which slots the plugin should save internally.
- Added some extra methods to the MythicInventory class, new internal name method to hold the internal inventory name.
- Lots of cleaning up, much more remains to be done.
- Added new MM "openinventory" mechanic
- Made MM soft-dependency
- Removed all imports of MM in favor of direct method references, allows for easier checking of the presence of MM.
- Moved MM mechanic registration to its own class.
- Updated documentation in README file
- Minor change: the inventory name will now be set to "Container" if it was not set in the config rather than the ID of the inventory.