Upgrade logger with centralized lazy logger

[MrMiumo]

Instead of usinng non-standard logger (appendToLog) with largely spread and duplicated debug level activation variables, I have upgraded the code to use a centralized logger. This logger (Log4J like) use patterns to reduce string concatenation computing for muted log levels. It also enable to factorize log levels and categories to make the code easier to read and maintain.

I alos have extanded some collapsed if conditions to increase readibility and replaces boolean comparisons with boolean operators. For example myVariable == false can be simplified with !myVariable which reduce cognitive complexity a bit