Fix generateBoard.py's behaviour for Windows
Fix generateBoard.py's behaviour for Windows

The fixes are related to the fact that both jinja (
https://github.com/pallets/jinja/issues/767 ) and templates expect
forward slashes only.
1. Use posixpath instead of os.path
2. Replace all backslashes with slashes in current folder returned by
os.walk()
CezaryGapinski/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,DISTORTEC/distortos,jasmin-j/distortos,jasmin-j/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,jasmin-j/distortos,DISTORTEC/distortos,jasmin-j/distortos,CezaryGapinski/distortos,jasmin-j/distortos