Changes.

- Fixed a bug in the /back command
- Added /tps command
- Added /plugins command to the console
- Added /list command
You don't need a ForEachWorld() here, you can simply iterate over the entire Lua table `TpsCache` using 
```lua
for worldName, tps in pairs(TpsCache) do
  Player:SendMessageInfo("World '" .. worldName .. "': " .. tps .. " TPS");
end
````