status: divide the code into small chunks & add a quick mode

This change divides the huge `runStatusAll()` function into small
functions with specific re-usable blocks. The new re-usability enabled
addition of a quick status mode which generates the same status only
from the manifest and lock file, and without any upstream project
knowledge. This quick status is completely compatible with the existing
`-json`, `-dot` and `-f` flags.

Author: darkowlzz