Mac full packaging

Following discussions on friday, here are some modifications to mac packaging for medinria :

- make install does not construct the bundle anymore
- mac_packager.sh.in is now built to accept inputs from superproject to build a full package (actually it was already able to do so)

Taken alone, this branch doesn't do much, but combined to packaging-mac on my superproject clone (PR to follow), it does medinria packaging