Implement late join so I can ride together sequential multiple group rides without excessive waiting or missing them

[Gerrie_Delport_ODZ (Gerrie)]

Adding this from another thread.

Late join needed to ride sequential group rides

perfect is the enemy of good as all software is typically broken to a certain extent if the late join feature is not working well make it an advanced feature and let me the end user choose whether to use it or not disabling the late join feature is the wrong R&D development choice after working a…