PMT should use the Forge's /v3 API

The PMT has been using an outdated, obsolete, and unscalable API for some time now. In an effort to deprecate those legacy APIs, we should update the PMT to use the more sustainable /v3 API.

One side-effect of this change is that we will be forced to handle all dependency resolution in the PMT (since the server-side dependency resolution was not sustainable). We should endeavor to handle that as elegantly as possible.