Delete the project file should ask to remove the project from workspace

Currently if I remove a git repository I getting asked if I want to remove the associated projects from the workspace.

If I delete a `.project` file (e.g. from git staging view or on the filesystem or Project/Package Explorer) it can happen that eclipse create an (empty) one again or complains that the file is missing.

I therefore think that deleting the `.project` file should trigger a similar action like when one deletes the project itself (e.g. select it in the project explorer and choose delete).