Plugins: reload after pref change

Remove from clients the need to reload Plugins after changing preference.

added sprintin progress ~24 labels

changed milestone to %Iteration 27

added sprintto review label and removed sprintin progress label

removed milestone %Iteration 27

mentioned in commit 010b9124

https://review.jami.net/c/ring-daemon/+/16937

added sprintdone label and removed sprintto review label

closed