Add support for average TPS placeholder

[cyberkitsune]

Currently the ${viewer server tps} placeholder resolves the server's instantaneous TPS. This can sometimes cause weird values (Like >20TPS) and very volatile values, like 20, then 11, then 20 all within seconds of eachother.

Can support be added for average TPS, such as the results of the /tps command?

Totally optional, colored output would be nice as an option too (green for >15, yellow for 10-15, red for <10 TPS)

[CodeCrafter47]

The built-in TPS placeholder is averaged over 2 seconds. If you prefer the values from Spigot's command you can use the placeholders provided by PlaceholderAPI for that.

• https://github.com/CodeCrafter47/BungeeTabListPlus/wiki/PlaceholderAPI
• https://github.com/PlaceholderAPI/PlaceholderAPI/wiki/Placeholders#server

You can use the custom placeholder mechanic to add color codes to the tps placeholder. Add the following custom placeholder:

customPlaceholders:
  # colored tps:
  # 0 - 12.5    -> red
  # 12.5 - 17.5 -> yellow
  # 17.5 - 20   -> green
  colored_tps0:
    !conditional
    condition: "${viewer server tps} < 12.5"
    true: "&c${viewer server tps}"
    false: "&e${viewer server tps}"
  colored_tps:
    !conditional
    condition: "${viewer server tps} < 17.5"
    true: "${colored_tps0}"
    false: "&a${viewer server tps}"

Then use ${colored_tps} to display the tps.