Fix a bunch of pylint issues

Issues like:
- fix bad indentation
- fix "More than one statement on a single line"
- add cast to be able to use str.splitlines()
- remove unnecessary semicolons 
- wrap some really long lines
- add missing spaces around operators and after commas
- remove some unnecessary pass statements
- remove some reimports
- OscConfigParser.py: fix __delitem__
- OscConfigParser.py: silence pylint false positive E0702