Summary:
It's somewhat annoying to keep restarting rage in order to manipulate the playlist. Having a keybind for clearing it
goes a long way for usability.
Test Plan: Add files. Hit c. Add more files. Skip around in the playlist. Clear. Add.
Reviewers: etrunko, raster
Projects: #rage
Differential Revision: https://phab.enlightenment.org/D1484
* fix mem leak of vid content
these thumbnails are generated in the bg by rage_thumb and will appear
once generated (or already found cached). it'll generate new thumbs if
modified dates are equal or newer on tthe src vs the thumbnail cache.
the caches store 160xN thumbs (keep aspect) with 70% lossy jpeg
quality in an eet file with one thumb per 10 second interval. so it
has limited accuracy.
Carsten Haitzler