[feature request] functional options pattern for main server configuration

[kaandesu]

functional options pattern for main server configuration:

• main server port
• main server name
• max number of concurrent rooms
• max number of total users?
• max number of total users per server
• log file destination

[kaandesu]

• max size of a single message
• or to be able to send large files (with CopyN until specified total package size)