Made Common namespaces more consistent

This is a follow-up on the decision we've come to in #7036.

A lot of the traits in Common still used old RA-style namespaces. This moves them to Common.Traits.

Additionally, this moves a couple more traits from RA to Common.
Personally I'd actually prefer to rename the effect. I don't really see a problem with ```RallyPointEffect```, we already have a ```CrateEffect``` afterall.