PRE-RELEASE: Complete rewrite

As I have been working on the Rust port I have learned the WebP and the GdkPixbuf APIs better and I decided to overhaul the C implementation while I still ponder if we should move to Rust yet. This is basically a port to C of the newer Rust implementation, I have been extra careful with memory leaks and have covered Pixbuf ownership a lot better according to documentation and other implementations.

This release fixes #61 and possibly others.

0.0.7

meson improvements and BSD compatibility

0.0.6

ci: use ninja -C for the build dir

0.0.5

edit of README.md, to add packages needed to build on Debian/Ubuntu.

Adds animation support

Adds animation support and adds macOS fixes.

Thanks to @alanhaw and @cameronwhite for their contributions.

0.0.3

Add option to set modules installation destination

Otherwise it's not possible to install it in non-system location, for
example in /app when the system gdk-pixbuf is using /usr.

0.0.2

This release adds a thumbnailer file. Thanks to @ebassi for the contribution.

0.0.1

Add initial .travis.yml