Quick note that if we do this we need to be extremely careful about file permissions. Right now it lets you save stuff to any file path if a resource supports associated files, so you can e.g. save out PHP files using this.

Before this is implemented, it is reasonable to just write custom code to implement whatever permissions a particular (e.g. mobile) project needs. So phase 1 gets us to a place that is usable by developers, and phase 2 is a niceity to clean things up more.