Prevent translation files in gst-plugins-base from blocking the build script
utils/misc: Use Gst.filename_to_uri instead of manually encoding URIs

Fixes bug #692331, ensuring that we can find the thumbnails for all files
medialibrary: Force quoting URIs right before computing the thumbnail hash

This prevents a case where the URI provided by GES in a project file
would not match what the f.d.o. thumbnail spec requires.
medialibrary: Avoid excessive work when searching/filtering clips
medialibrary: Handle special characters in the filtering search entry

Fixes bug #692333
Add the source of the "Codecs & containers" figure for translations

You can open it with Inkscape, translate, export to PNG
and convert to JPEG to keep the resulting filesize down.
mainwindow: Force calculating the toolbar height at the last minute

Somehow, on some monitors, the height being reported would change at runtime.
Update effect categories

Categorize new effects, merge "Noise" and "Blur", add a "Compositing" category.
utils/ui: Properly ignore subtitles, including the new DiscovererSubtitleInfo
effects: Scale down thumbnails to fit better in the new listview arrangement
render: Properly save the render directory

Fixes bug #661074
render: Stop rendering when the user presses Escape