Clean up GalaxyRP cvars.

[alexnita3]

There's some cleanup to do in the server cvars. A lot of them can be reduced to a single bitvalue, whereas others are not used at all.

Go though each of them one by one, and, where possible, either remove the cvar, or grab a group of them and combine them into a single bitvalue. All the bitvalues should come with a bitvalue calculator.

[TriForceX]

Consider to change zyk_ cvars to rp_ in this cleanup

[alexnita3]

I like that, let's replace them