Revision of tor-mirrors.csv

See https://lists.torproject.org/pipermail/tor-mirrors/2018-April/001158.html:

https://gitweb.torproject.org/project/web/webwml.git/plain/include/tor-mirrors.csv

1. The .csv is in need of cleanup, there is a mix of TRUE/FALSE/True/False/YES/NO/Yes/No that should be streamlined into one flavour.

2. Most subRegion/region entries are most likely wrong? At least there are different interpretations on what it should be.

3. The tormirror.snydernet.net entry is missing a region entry, causing the rest of the entries to become misaligned