[script,engine,test] Allows the user to specify the number of steps for threshold/performance analysis

[utils.metric] Rename as measure as some of the values are not real metrics; Add tests for AUC and improve its implementation

[engine.*] Move model summarization to training; Separate static information from dynamic information logging

[engine.trainer] Flush CSV file as we log it (every epoch); Only output minimal information on the screen

[engine.trainer] Implement thorough resource monitoring; Do not plot in the end - writing a CSV is fine already

[script.*] Implement F1-score a priori where possible; Improve plotting of precision-recall curves with better legends, more consistence; Remove redundant plotting code; Update tests

[engine.trainer] Move creation of output_folder into engine; Call train argument output-path -> output-folder to make it more explicit