Hoverdrive Controller: Fixed deleted ConVar
Fixes http://errors.garrysmod.com/error/1450461536/
MakeWireEnt: Fixed many bugs; no longer copies whole enttable
duplicator.GenericDuplicatorFunction was only intended to be used on entities
that don't have a RegisterEntityClass defined, so it copies all variables
rather than just the ones the class needs.
This fixes a ton of bugs when using the Garry duplicator on any wire entity
using MakeWireEnt. Fixes #388 and http://errors.garrysmod.com/error/3549022570