Improve debug logs

[panleone]

Abstract

debug logging imo is very important, but at the moment is quite unused since we have to wrap each console.log inside a if(debug){...}
This PR solves the issue by adding some util functions like debugLog;
DebugTopics are also added, so we can easily understand which part of the application printed the message
finally DebugTopics can be activated and deactivated: this can be done from the file debug_config.json

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Testing

Activate debug and see that it works as expected

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[Duddino]

It's also useful to have a way to disable certain topics. If I'm debugging network, I usually don't want logs for wallet for example. You can do this by putting the setting in a config file, (see chainparams.json). You can also add log error levels (Debug, warn, error) and a way to filter (use the console functions so we can also filter them using the dev tools).

[panleone]

ready for review

[JSKitty]

tACK 1365249