- Cover up errors from OnMaxStackable hook when vanilla defaults isn'…

…t set correctly.

- Provides additional information when vanilla defaults can't be downloaded for some reason.

Merge branch 'dev'

Merge pull request #18 from AnExiledDev/dev

Release v4.0.0

Release v3.4.0

**NOTICE:** Potentially volatile update, which is why the minor version change, I'm using a new hook which may be a little more viable but I'm not entirely sure how often it's run on a populated server, and may conflict with other plugins using the hook (but really shouldn't.)

- Fixed attachments being removed when moving to an empty slot.
- Fixed more attachment shenanigans.
- Water goes poof less often. (Reminder though that you can't stack things containing water. If you want this limit hardcoded so water won't stack with a config option let me know.)
- Moved CanStackItem functionality into CanMoveItem, and removed CanStackItem functionality. Should increase compatibility and stability. However there may be new plugin conflicts or performance issues potentially, please report anything you notice.

- Resolved KeyNotFoundException