Include boat types to `EntityTag.color` (#2539)
* Update `boat_type` to use new Spigot API
* Update to work on different versions
* Update meta
* Make functions `abstract`
* Deprecate `boat_type` in favor of `EntityTag.color`
* Remove unneeded version check
* Update tag link
* Add version check for deprecation notices + cleanup
* Remove unneeded version check and move enum check
* Remove `get/setBoatType` functions and move contents
* Update `switch` statements
* Use `as()` method instead of casting `getEntity()`
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commit: 3d9b608)
