Add new functions for HLTV clients

[RaphaelIT7]

Details

Currently, it's impossible (as far as I can tell) to do anything with a HLTV client from Lua, and it would be useful if at least a few functions exist.
It would be useful these things got added:

• A way to get a HLTV client/a new library like the player library but for HLTV with functions like GetAll, GetByID, GetBySteamID and GetCount
• • Returned HLTV client should have a few functions like :SteamID(), :GetName() and :GetUserID() (Maybe also :SendLua()?)
• • Being able to send net messages to the HLTV client

NOTE: The HLTV Server currently doesn't call net.Incoming when a HLTV client sends a message

• Maybe a new hook which is called when a command is executed

Other things which would be nice to have:

• The ability to create and send gameevents(HLTV:FireGameEvent() & BroastGameEvent()) like hltv_fixed or hltv_chase which would allow one to have more control
• a new hook which is called for CHLTVDirector::StartNewShot() with the ability to cancel StartNewShot if true is returned.

NOTE: This is all based on the Idea that the CHLTVClient is used which should have most of functions that are needed.