Allow different log formats and destinations

[gsalomao]

Description

Allow logging using different formats and destinations.

The allowed formats are:

• pretty where the output is in text with colours
• text where the output is in plain text (no colours)
• json where the output is in JSON format

The allowed destinations are:

• console where the output goes to the console
• file where the output goes to a file

The format and destination shall be chosen by configuration (maxmq.conf or environment variables).