code duplication `str2bool`

The str2bool function appears multiple time in the code:

• https://framagit.org/iota2-project/iota2/-/blob/develop/iota2/Common/FileUtils.py#L548
• https://framagit.org/iota2-project/iota2/-/blob/develop/iota2/Common/Tools/checkDataBase.py#L23
• https://framagit.org/iota2-project/iota2/-/blob/develop/iota2/Classification/ImageClassifier.py#L32
• https://framagit.org/iota2-project/iota2/-/blob/develop/iota2/Common/Tools/checkRegionDataBase.py#L23

It should be moved to a "user input" module.