Add option to disable register message spam

[KaspianDev]

I noticed that registering conditions causes a lot of spam in logs. So I added a config option to disable it (it sends them by default).

I also consider changing the option name to log-register but let me know if I should do that.

[AlessioGr]

@KaspianDev

Generally looks good, just a few things:

1. Can you change the config key to "logging.verbose-startup-messages"? I think it would be a little more clear
2. change isLoadingMessages to isVerboseLoadingMessages
3. sometimes you have used "isDebug()" instead of "isLoadingMessages()" in the if's. Prob should be changed to isLoadingMessages as well

[AlessioGr]

thank you!