Allow to hide top-voters which have not played before

[BlvckBytes]

Hey!

We've recently set up a hologram displaying the names of the top 10 voters per month and ran into the issue that even mistyped names show up on there, which is rather undesirable. This probably doesn't happen on large and active servers, as typo vote-counts are tiny in comparison and fall to the very bottom, but with smaller communities, these votes will show up sooner or later.

Since I'm not familiar with the code-base much, I chose a simple solution, namely to hide entries right before sorting the top-list if the flag is enabled and they have not joined the server before. To keep behaviour unchanged relative to prior builds, the flag is default-false.

Looking forward to feedback of any kind if applicable and would be happy if we can get a feature like this in.

[BenCodez]

The only issue with this is on proxy setups where the offline player check may not be accurate on each backend server. You could disable allowunjoined to prevent invalid names from coming in.

Could also add a required amount of votes to be on top voter as another solution. But this could work on single server setups, but may get confusing on proxy setups.