Renderbase: Show rerecord count

[malleoz]

This PR adds a "Show Rerecord Count" toggle under the Movie menu. When enabled, this causes the RenderBase to show s_rerecords in the Movie window.

Note that the rerecord count will show 0 if a movie is not being recorded or playing back. I'm curious if anyone has any thoughts about if this should be hidden? Perhaps check for if IsMovieActive()? Or perhaps if the rerecord count doesn't update, it's a healthy reminder to TASers that they aren't actively recording a movie (I sometimes accidentally forget to check if I am in read-only mode or not).

[Pokechu22]

Code looks good to me. I think it's fine to keep it visible when a movie isn't active, though perhaps "Rerecords: N/A" would also work. Maybe the read-only status would also be useful to include in the movie window, though?

[malleoz]

Code looks good to me. I think it's fine to keep it visible when a movie isn't active, though perhaps "Rerecords: N/A" would also work. Maybe the read-only status would also be useful to include in the movie window, though?

I've decided to check IsMovieActive() within Movie::GetRerecords() to show N/A if no movie is currently active. This should suffice for now. To show the status of read-only can be its own PR in the future I figure.