Support for different servers acting as channels

[alborrajo]

This PR adds support for the following:

• Specifying the log directory path in the config file
• Specifying the config file path with command line arguments
• Adding DB entries for connections in different servers when the client requests it

These three features combined allow running multiple instances of the server, sharing assets and database, with the client being able to switch between them using the ingame World Select option by doing the following:

1. Create a copy of the config file (Files/Arrowgene.Ddon.config.json), naming it, for example, Arrowgene.Ddon.config-2.json
2. Editing the config file to have a different LogPath directory, for example, "Logs-2"
3. Editing the ports 52000, 52099 and 52100 to different values, for example, 42000, 42099 and 42100
4. Editing the GameServerSetting.ServerSetting.Id to a different value. In this example, 20
5. Editing the LoginServerSetting.ServerSetting.Id to a different value. In this example, 2
6. Adding a new entry in the shared asset file GameServerList.csv, with the new server with its ID and ports, and a name to easily identify it.

#Id,Name,Brief,TrafficName,TrafficLevel,MaxLoginNum,IpAddress,Port,IsHide
10,Local Host,Brief,Traffic Name,0,1000,127.0.0.1,52000,false
20,Local Host 2,Brief,Traffic Name,0,1000,127.0.0.1,42000,false

Now you can launch the first instance with the arguments: server start and the second with: server start --config=Files/Arrowgene.Ddon.config-2.json

Checklist:

• [X] The project compiles
• [X] The PR targets develop branch