Improvements
New auto-complete functionality for element() usage in templates:
No more typing of the full file name necessary, it will even find your plugin's elements or nested ones.
Demo: https://streamable.com/ixrbg
Adjustments
CakePHP 3.5 and 3.6 are only supported from here on.
This is necessary as 3.4 does not fully work with PHP7.2+, and otherwise testing compatibility is difficult.
Make sure you upgraded to at least 3.5 already.