support resize of animated gifs with imagick

[plandolt]

support of resizing images with multiple layers with imagick.

feedback very welcome!

[romainneutron]

Hi @scuben ! Thank for your work, and sorry for the delay.
Could you add a unit test?

[armatronic]

Hi @scuben and @romainneutron, I've added a pull request against this branch which (I hope!) covers this case adequately, you can see it here: plandolt#1

[plandolt]

Thanks to @armatronic for adding the tests!

[armatronic]

@romainneutron this should build properly once it's rebased onto develop, since the build issues have been resolved since this PR was opened.

[talbotseb]

Any idea what still needs to be done for this PR to be merged ?

[armatronic]

@talbotseb as far as I know only the CI checks were failing, I've been using this in production for a while now.

[trsteel88]

@romainneutron this appears to work. Any update on when this will be merged.

Fyi, the casing is incorrect for 2 methods in the code. It should be "coalesceImages" and "deconstructImages"

[trsteel88]

@scuben, you might want to fix that method casing btw.

[dupuchba]

It would be great to get this implemented, can someone re-launch the build ?

[burzum]

@dupuchba I would like to but I can't. :( @avalanche123 can you?

[mlocati]

Included in #481 (that was already merged).