* Add support for Spigot 1.21

This release includes new features and overall improvements:

* Now supports translations. Translations can be added within the /lang-folder and may be specified in the config.yml. Added translations for EN and DE
* Now supports custom offsets for smokes. This allows for the creation directional smokes
* Will not let players teleport the smoke-locations by clicking on a smoke-location-item in the list-view ( /smoke list)
* Bug fixes & code-improvements

Notes:
It is recommended to delete old config.yml before migrating.
For existing smokes the custom offset will be x=0.0, y=0.0, z=0.0.

This release focuses on a lot of cleanup tasks and introduces a new feature to specify the spawn-frequency of smoke.

For Spigot 1.20.4
Requires Java 17+

Notable Changes:
- Refactored configuration handling (please delete old config.yml before updating)
- Now uses a JSON file as storage instead of a binary file
- You can now customize the frequency of smoke-spawning in server-ticks per location using /smoke add (frequency). Frequency can be any integer number of 1 or greater. A frequency of 1 will spawn smoke every 1 ticks and creates a more denser smoke than a frequency of 7
- Code-Cleanup