739 logs

Related to #739

In the end, I didn't use slf4j and an implementation and rewrite a simple logger by myself. Because of this, the user doesn't need to change his factory path to keep project working.

Also, there are two new annotation processing options : logLevel and logFile (which can contains the placeholder `{outputFolder}`).
The default level is DEBUG, and if no logfile was specified AA will try to resolve the log path by looking if these folders exists (in this order) :
* target
* build
* bin
* root folder
* execution folder (ie: IDE folder or console current folder)


Note : This PR is not finished yet. I still have to add some logs in some important points. But you can start reviewing it.