HydroShare Copying: Edit Project via Snapshot

[rajadain]

As discussed in #2990 (comment), a user may copy a resource in HydroShare and want to edit in MMW. This requires we open someone else's project, copy it to the user's account, and associate it with the given resource.

• Make an endpoint at /project/via/hydroshare/$resource_id/edit/ that does this
• Workflow will be like:
  • Check if the resource is already associated with a project.
    • If so, check if the current user owns the project.
      • If so, open the project.
      • If not, copy the project to the user's account, and open the project
    • If not, fetch the resource's file list and look for project snapshot file.
      • If not found, show error.
      • If found, read the file and find the originating project
        • If that project is not found, 404.
        • If that project is found, check to see if the user owns it.
          • If so, open the project.
          • If not, copy the project to the user's account, associate it with the given resource, and open the project

Requires #2999
Requires #3000