Added chat command /countblocks to see how many blocks a base has
Added permission "buildingrestrictor.count" for the above command
Added caching for nearby structure detection - This is somewhat experimental and will require testing on larger servers to determine a true performance impact. All other solutions for improving this function yield a similar amount of processing time, so by doing this the actual check for nearby buildings only happens once every 60 seconds with nearby buildings temporarily recorded (as opposed to every time a block is built). This gives near 0 performance impact of that function for those 60 seconds that the data is stored after which it will perform the check again