plot-sign update (via auto-regeneration or new command)

PlotSquared Feature Suggestion:

Plot signs are the one way to have a redundant plot info (e.g. in a backup without installed PlotSquared you see the important plot-owner name on the plot-sign.)

The problem: if a plot-owner change her name, the signs don't show the new name. Only with a /p setowner command or other plot-change commands it will display the new information.

How should it be implemented?

As I know, PlotSquared update the mysql data if a player join with her new name. In this or other situations the plot-signs can get a regeneration if the chunk is loaded. A new sign-update command (like /p updatesign) is a good alternative too.

Checklist:

• I made sure there are no duplicates of my suggestion (Use search)
• I made sure my suggestion does not exist yet (Check the wiki)
• I made sure my suggestion is useful for the majority of PlotSquared users

Start by tracing the existing plot-sign update path and the handling of player-name changes. Compare automatic regeneration for loaded chunks with the proposed /p updatesign command, then verify the chosen behavior updates signs to the current plot owner without requiring another plot-change command.