More performant o.plugins

[Tryhard999]

Reduced allocations and overheard from running the O.plugins command, useful for RCON tools and such that might run it often

[MrBlue]

I'm not opposed to changing the way this command works but I feel like we can make it a little bit more readable and clean it up using StringBuilder.AppendFormat for example:

output.AppendLine();output.AppendFormat(string.Format(" {0} \"{1}\" ({2}) by {3} ({4}s) - {5}",pluginCount++.ToString("00"),plugin.Title,plugin.Version,plugin.Author,plugin.TotalHookTime.ToString("0.00"),plugin.Filename.Basename()));