Don't manage any applications that are agents.
Don't manage any applications that are agents.

This includes menu bar applications like Creative Cloud whose windows were
causing layout problems.

Fixes #45

m4rw3r/Amethyst,olsonpm/Amethyst,hooplaaa/Amethyst,hooplaaa/Amethyst,egabancho/Amethyst,cevaris/Amethyst,ianyh/Amethyst,cevaris/Amethyst,ianyh/Amethyst,olsonpm/Amethyst,egabancho/Amethyst,m4rw3r/Amethyst,ianyh/Amethyst,ianyh/Amethyst,ianyh/Amethyst