FIXBIK: Add fixbik, a small utility to trim headers off EMI movies.

[JoseJX]

This is just a small utility to remove the SMUSH headers from the EMI movies. With the headers removed, you can watch the movies in mplayer. I wrote this because I wanted to check that all of the EMI movies were full screen movies. They are!

[klusark]

I thought we had a better way to scan for the BIK header, but I can't find it now... @chkr-private can you comment?

[tombsar]

Existing implementation in ResidualVM is here https://github.com/residualvm/residualvm/blob/master/engines/grim/movie/bink.cpp
I think it would be applicable if the files in question are using the SMUSH header.

[JoseJX]

Here's an updated version to address your review, thanks!

[klusark]

Did you see my other two comments?

[JoseJX]

I did, but the one that isn't incorporated into this is the last one regarding using existing code for identifying the SMUSH header. It's probably a good idea to use that. Is there a way to link the existing code in ResidualVM from the tools?

[klusark]

I somehow missed adding the buffer.

You can't link any code from residualvm unfortunately. A lot of the code is duplicated for that reason. Just copying it would be fine.

[JoseJX]

This new version reads in the SMUSH header, finds the size and then skips it just like the code that you pointed to. Instead of pulling in all of the common code for stream handling, I just implemented it in a similar fashion. I hope that's okay!

[JoseJX]

Updated again for syntax style, sorry!