Add user tracking to EGP HUD

[Denneisk]

E2 functions:

• xwl:egpConnectedUsers() - Returns an array of users connected to an EGP.
• xwl:egpHudToggle(n) - xwl:egpHudToggle() but with a specified on-state.

E2 events:

• egpHudConnect(Screen:wirelink, Player:entity, Connected:number) called globally when a player connects or disconnects to an EGP HUD.

Fixes #2620

Also included a few other cleanups for EGP HUDs:

• Removes usermessages and other deprecated functions
• Optimized/simplified some things

[Denneisk]

Also I don't have friends and I don't know how to do the dev thing so I didn't test having more than one user. Would appreciate if someone could do that.

[Denneisk]

Ah fancy linter

[thegrb93]

Looks much cleaner, thanks. You also have some print and PrintTable in there still.

[Denneisk]

Ah, right. Had trouble with that function before realizing that events triggering at the same time as an E2 function breaks things for the running E2 chip.

[Vurv78]

I don't think egpHudEnableSilent should be a separate function, should just have an overload egpHudEnable(nn) where the second number is 0 or nonzero for silent.

[Denneisk]

I thought so, too, but then I wondered, when would people ever use that overload without setting the second argument to 1?

[thegrb93]

The silent option shouldn't have been added. The print is always there for a reason.

[Denneisk]

Well it annoys me, but if it's too big of an issue, I'll get rid of it.
Do I have to fix all of those lints, by the way?

[thegrb93]

No, probably only going to enforce them for changes someone introduces.

[thegrb93]

Entering a vehicle linked to an egp shouldn't be silent

[Denneisk]

That was its behavior before. How about we split it 50/50 and have a convar?

[thegrb93]

Yeah I guess you can have a client cvar to hide egp messages.