Suggestion: Quickly add multiple plots into a plot group

[CrypticBlades]

Please explain your feature request to the best of your abilities:

Currently, you would have to add each plot to the group individually by visiting that plot and then using a command to add that to the plot group. It's fine if only working with a few plots but when that quantity starts nearing the hundreds it can become tedious. It would be nice if there was some way to add them to the group without having to use the same command every single time.

A possible solution would be to make it just like town claiming where you could define a radius to select plots to join the group. Would also be a good idea to implement the ability to automatically add the plot the group by walking to the plot to avoid having to use the command several times for every single plot, similar to /res toggle townclaim.

Another solution which I believe to be more user friendly would be to have users define an area using two opposite corners, just like how worldedit selection can define a region for worldguard. In the long run, this would help to efficiently modify large areas of plots into groups. You could also use this selection feature to apply many other modifications to plots such as setting the plot type of multiple plots, claim or unclaiming large areas of plots, evict, set for sale, etc. This solution may require more effort on your part to implement but I believe it would be nice to have.

Anyways these are just suggestions, do whatever works best for you!