Stop anything from spawning

I am trying to make a build server,   i have a blank flat map,  i have stopped animals spawning,   anyone know of a plugin to stop loot, barrels,  hemp, driftwood,  boats,  rock and ore and anything else from spawning?

that looks like it will do the job perfectly,   many thanks

Merged post

ohh the sercond bit,   can that be put in server cfg?   or console and writecfg

safest in the server.cfg file or in the server start line.

many thanks,  you are a legend