Changes

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()`
 (commit: 3d9b608)