Add player count to scoreboard

[GooberRF]

Adds the current server player count to the scoreboard for all gamemodes as shown in the screenshots below.

Resolves #27

[is-this-c]

I do not really like its verbosity. I think it should have a console command.

[GooberRF]

I do not really like its verbosity.

I don't think it's verbose at all. I've also tested with bighud on and off, all gamemodes - in no case is it even close to in danger of getting cut off. IMO this is a straight improvement over the original.

I think it should have a console command.

I'm not opposed to it being associated with a console command as toggle, but I also don't think it's necessary. Will wait to hear rafalh's take on this point - I'd be happy to tie it to a console command if he wants it that way.

[is-this-c]

It looks much better like this imo. (My scoreboard is slightly altered.)

[GooberRF]

It looks much better like this imo.

I like that, but I don't think removing the "Red Faction" logo is a good idea, at least as a default. I do like the use of a pipe as opposed to the " WITH ", though:

[is-this-c]

but I don't think removing the "Red Faction" logo is a good idea

When I mentioned my scoreboard is altered (it is old code) it was about this ugly logo 😊. Moreover I tested a few variations and - was good but | probably better.