Startup progress bar doesn't wait for `--precompute-light` to finish

[kpreid]

This is because the precompute-light code uses a separate indicatif progress bar which isn't hooked up to the progress notification.

[kpreid]

I think the right thing to do here is to have indicatif hooked up to the notification hub like the VUI progress bar is, so that the “application” code isn’t thinking about indicatif at all.