Shows a VGUI panel to a specific client.
void ShowVGUIPanel(int client, const char name, Handle Kv, bool show)
Panel type name (Check viewport_panel_names.h to see a list of some panel names).
KeyValues handle with all the data for the panel setup (Depends on the panel type and may be unused).
True to show the panel, or false to remove it from the client screen.
If the client is not connected an error will be thrown.