[Cin] Upgraded thirdparty libraries vpx and lv2 + minor changes

[Phyllis Smith]

The GIT repository checkin includes some changes not part of MantisBT:

- upgraded libvpx from 1.7.0 to 1.8.0 to be used for all distro builds
(hopefully this will avoid our Arch confusion)
- upgraded LV2 library from version 14 to lv2-1.16.0  THIS IS OF SOME
CONCERN but changes seemed reasonable
- you can now nest and unnest multiple clips instead of just 1 at a time
- bug when you play a selection on the timeline and it stops, and when you
play again, you have to hit space bar twice
- modified ABOUT in the settings so that you can see more important stuff,
like latest month's changes
- added shortcut shift-d to delete the first track (this was handy for us
to have); change "create DVD" to alt-d instead

If you do your own builds and just use Cin in your daily tasks, and notice
anything wrong, please report.  gg/phyllis
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.cinelerra-gg.org/pipermail/cin/attachments/20190402/af4bcbaa/attachment.html>