Do not listen for SIGUSR1 since Windows does not have it
Add windows workaround for IPv6 sockets to also listen on IPv4
Fix flake8's whitespace error
log: Don't filter anything at all on the root logger itself
log: Use custom filter to implement verbosity levels

...instead of hooking handlers onto multiple loggers with disabled propagation
from those loggers to parent loggers, breaking alternative log methods, like
custom setups through the the logging/config_file config value.

Fixes #661
log: Make other logging work when logging/config_file is in use
docs: Update changelog
Bump version number to 0.18.1
docs: Update changelog for v0.18.1
Release v0.18.1
Merge remote-tracking branch 'abarisain/window' into develop
network: Check for windows platform match
docs: Update changelog and author for windows fixes
Merge remote-tracking branch 'UncommonGoods/develop' into develop
docs: Update changelog and authors