parser-target as CLI option

I don't know, if theres already a ticket about this, so I'm sorry, if this is an duplicate.

Right now I can specify the path where to put the cache files into in `phpdoc[.dist].xml` and as CLI-option for `project:parse`. I'd like to suggest a new option for `project:run`: `--parser-target`.
At least you are consistent .. (`ccahe-folder`)