Move ConVar API into its own include.
Use new-style.
Add C++ definitions.
Port reservedslots.
Port rockthevote.
Port randomcycle.
Port nominations.
Port mapchooser.
Port funvotes.sp.
Port basevotes.sp.
Port antiflood.
Port basechat.sp.
Port basecommands.sp.
Port basecomm.sp.
Port gag.sp.
Port remaining .sp files.
Merge pull request #199 from alliedmodders/tr-convars

Port ConVars to transitional syntax.