Minor wording tweaks.
Add a props file for 3rd party libraries.

This way, we'll be able to use separate settings more easily.
Remove `EnablePREfast` and `TurnOffAllWarnings` properties.

Now, we set them in common-3rd-party.props.
Remove unneeded properties.
Update unrar to v5.2.1.
Initializer list order fixes.

Found with cppcheck (inconclusive enabled).