Add Firework meta

Just in time for Guy Fawkes!

Includes the necessary handling of ItemMeta for Firework charges and Fireworks.

Yep, that's about it.

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*Edited by turt2live*

**Related Links:**
- Ticket: #77
I've submitted a pull request to change this considering your PC is dead <3

https://github.com/ZephireNZ/Glowstone/pull/5

Once accepted (or a similar change done), this is ready to be pulled :3