Beginning GIF export

Beginning addition of an option to export animated GIFs
from the Open -> Slideshow dialog, after choosing the images.

Non-operable at this time, but a button has been added (and will
provide a hint to select 2 or more images, when clicked).
This commit is contained in:
Bill Kendrick 2020-07-25 00:18:46 -07:00
parent 3ede0b96bf
commit 8c3a07294b
7 changed files with 408 additions and 16 deletions

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After

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