Blue ish RTBR Citadel addon

Changed to match the feel of the blue combine technology. Extract the contents to your Custom folder, If you don't have one, create one. If done correctly, it should look like this: C:\SteamLibrary\steamapps\common\Half-Life 2\RaisingTheBarRedux_div2\custom\Blue-ish RTBR Citadel Enjoy.