Refactor logging

[chrisveilleux]

Description

Add a logging configuration that:

• Rotates log files at midnight
• Keeps two weeks worth of rotated log files
• Defines a format for log messages, including the file and function that generated the message
• Writes to log files instead of stdout

Converted all calls to the old logger to use the new logger and edited some log levels.

Type of PR

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• Bugfix
• Feature implementation
• Refactor of code (without functional changes)
• Documentation improvements
• Test improvements

Testing

Ensure that the log messages are being written to files in /var/log/mycroft

Documentation

The new logging configuration code is documented.