Log Message:
mypaint: update to 2.0.0.

MyPaint v2.0.0 (2020-02-15)

After a bit of a lull in development, MyPaint 2.0 has arrived at
last! Many have already tried out the new features in the new
automated continuous appimage releases, but for those who prefer
to use stable releases, this is the time to pester your distro's
package maintainers (or better yet, package and take a maintainer
role yourself).

Why is this 2.0 and not 1.3?

MyPaint 2.0 adds a new layer mode and uses a different compositing
method than before (by default, this is configurable), which means
that you can create files in 2.0 that will not look the same when
opened in earlier versions. Additionally, changes to the brush
parameters means that you can create stroke data in 2.0 that cannot
be safely used in earlier versions.

Major New Features

    Linear compositing and spectral blending (pigment).  Layer
    views.  Brush strokes dependent on view rotation and view zoom.
    Additional symmetry modes: vertical, vertical+horizontal,
    rotational, snowflake.  Expanded flood fill functionality:
    offset, feather, gap detection and more.  New brush settings:
    offsets, gridmap, additional smudge settings, posterize, pigment.
    New brush inputs: barrel rotation, base radius, zoom level,
    gridmap x/y, direction 360, attack angle.