Update to 4.16

UPDATE TO 4.16

Road editor has been updated to 4.16. This is accompanied by a curbs update, we are now allowed to integrate curbs with roads, which makes it possible to have rail guard or sidewalks at side of the road, enable or disable.

We also include a start and end transition mesh for curbs.

Curbs with offset are compatibles with roll. We also include various improvements in the config editor. An example called DefaultConfig_416 is available in the content of the plugin to show you the use of these curbs.

4.15 will be available until the release of 4.17