Add optional radius to /greportsnear

[Blobehh]

So I don't get spammed in chat and find it hard to see if its been greported or not, happens at spawn when lots of grief reported within the current default set radius. /greportsnear <radius>

Edit: Also add option to search for a certain block in set radius which looks for a word match in players greport messages, /greportsnear <radius> <block>,

[Anna Bakker]

Same thing could be done with /wholiveshere, but both these commands should have a max radius and possibly a min one.

[Anna Bakker]

Both these commands would be mainly useful at /spawn where there are a lot of greports and homes in the same general area

[Anna Bakker]

add radius options for greportsnear and wholiveshere, resolves #406

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