Use standardised log output with timestamp for all output

Currently when running a scan, the program outputs lines on the form
"Inspecting project [project id]"
while for example errors use a full logging mechanism which includes a timestamp. This is annoying if you have a long running scan and you want to know how it is progressing along and when the last message was logged. Since all the actual results of the scan is saved in a separate structured format, I would propose that all other output should be considered logging and use the proper logging facilities.