Couple Changes and Additions for Houses

[DragonSlayer62]

• [FIX] Fixed an issue where guests count was not showing correctly on the house sign
• [ADD] Added new Multi JS Methods for adding and removing vendors in player houses, and updated relevant scripts (js/commands/targeting/remove.js, js/server/house/house.js, houseCommands.js and playerVendorDeed.js) to make use of these to fix issue where player vendors were not properly registered with houses:
  • .AddVendor( playerVendor ) // Register player vendor with multi
  • .RemoveVendor( playerVendor ) // Unregister player vendor from multi