new logging implementation

[jflann]

Implements custom logging with the logging library.

Features:

• log to file and to console
• colored output for console, plain output for log file
• configurable msg format and color for each log level
• a single function call builds the logger for you in the main program

Opening as a draft because of still needing to configure the behavior related to setting log levels and the implementation of a verbose flag. Currently the build_logger() function takes a verbose parameter, which then sets the log level on the logger. It is possible to set the log level on the handler level, specific to log destination (console vs file).