WebKitGTK 2.39.1 released!

This is the first development release leading toward 2.40 series.

Use ANGLE for WebGL implementation and enable WebGL2.
Remove internal nested wayland compositor making libwpe mandatory when building with wayland enabled.
Prefer EGL over X11, intead of GLX, where available.
Add support for background-repeat: space.
Add API to check if a response policy decision is for the main resource.
Fix rendering of checkbox and radio buttons in black backgrounds.
Make checkbox, radio and inner spin button scale along by page zoom.
Add support for get computed label and get computed role WebDriver commands.
Fix several crashes and rendering issues.

Thanks to all the contributors who made possible this release.