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Adding gdk-pixbuf as a dependency to libpurple is kind of questionable, but it's dependencies are really just libpng, libjpeg, and libtiff. In other words, nothing UI specific. Which means we can remove a bunch of API with this change which is awesome.
This is the first step in replacing `PurpleImage` with `GdkPixbuf`. Which will also eventually include `PurpleBuddyIcon` and remove the need for `PurpleBuddyIconSpec` as protocol plugins will just be able to scale and format images themselves.
* Move `pidgingdkpixbuf.[ch]` to `purplegdkpixbuf.[ch]`
* Renamed all function from `purplegdkpixbuf.[ch]` to be in the purple_gdk_pixbuf namespace
* Removed all unused function from `purplegdkpixbuf.[ch]`
I also did some research on how much disk space adding gdkpixbuf would add.
The base is a base debian container and this is against libpurple2 which is obviously going to be different. But the question was how much additional disk space will be used by adding gdkpixbuf.
```
base: 157680
bitlbee: 216452
bitlbee+gdkpixbuf: 222388
bitlbee-purple *: 363860
bitlbee-purple+gdkpixbuf *: 369796
* --no-install-recommends
```
We can see that for gdkpixbuf will about about 6MB of of disk usage which I would hope would be acceptable when libpurple adds 141MB by itself.
Testing Done:
Ran and verified that an animated buddy icon was still displayed properly in the infopane and the buddy list.
Reviewed at https://reviews.imfreedom.org/r/1224/
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