Add "-v | --version" cli runner parameter to get tester version

[SendiMyrkr]

trafficstars

• bug report? no
• feature request? yes

First and main motivation is simplier way to get used version. And i believe it's common way to get version.

[chemix]

👍

[dg]

I think that simpler than tester -v is just tester. It prints version.

[Fuco1]

The help output is not really great for machine consumption, which the -v strings sometimes try to be (not always though)