[Suggestion] Add grid target to essentials commands #135

Hello !

I would like to see a feature in essentials that could be very helpful for admins.

Currently, the commands such as below are meant for all grids in the world.

!blocks on type StringType (orsubtype)
!blocks off type StringType (orsubtype)
!blocks remove type StringType (orsubtype)

What I would like to have is a possible grid target and player target.

For example :

!blocks on type StringType "GridName"
Would switch on the specified type only on the targeted grid.

!blocks remove subtype StringSubType "PlayerName"
Would remove the specified subtype only on grids the targeted player owns.

Thank you for considering this idea and thank you for your hard work !