[Cin] Chromakey improvements checked in to GIT

[Phyllis Smith]

Chromakey plugin has had its menu improved by anonymous contribution and it
has been checked into GIT.  (Andrea, can you test it too? and check the
manual to make sure still matches and make new image?)

Improvements include:
- added Default button
- default values for Threshold and Slope changed from 60 to 10 and from 100
to 0 as much more practical
- position of Threshold and Slope switched because Threshold is more
relevant
(Previous 2 items were suggested by Andrea)
- textbox with arrows added for much easier access to current setting
- individual "reset" icons added
- location of "Use color picker" put into better position
- other minor stuff
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.cinelerra-gg.org/pipermail/cin/attachments/20240521/98ea45df/attachment.htm>