Footage information panel

Displays such information as current frame dimension,
frame number within image sequence/movie and in case
of image sequence input displays current file name of
a frame.

Not entirely happy with such approach, but was requested
a lot by artists.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56203 954f8c5b-7b00-dc11-b283-0030488c597c