Timings command changes

This PR cleans up the formatting of Spigot's changes to the timings command, bringing it back in line with the same formatting style of the default bukkit command.

This PR also notifies user's when timings is enabled/disabled already when they attempt to use the /timings off or /timings on command where previously it would just spurt the this command is disabled message.

This PR also cleans up a few inconsistencies where some command arguments would tell you to enable timings via /timings on.