audio and movie missing file display

[samsc]

I made SAMSC check a directory called "SAMSC Media Library" that is in the same folder as the application. It looks for the file name in this place first - before looking anywhere else.

this is in d19

[samsc]

added another way to do this in d20.

i have added another search path for media files, at the samsc show file level.
When locating audio files, SAMSC will now search a directory called "Show Media Library" at the same level as the current show file.