Bump versions

tools/builder: Add codec option

cc #135

(cherry picked from commit e4328e6)

Add encoding speed option

This adds --speed option in kdynamicwallpaperbuilder, 0 - slowest speed,
10 - fastest. The encoding speed can potentially affect resulting file
size or encoding quality.

Example usage:

    kdynamicwallpaperbuilder --output foo.avif --speed 6 manifest.json

Bump version to 4.3.1

Fix absolute time fallback in the solar engine

Bump version to 4.2.0

Bump version to 4.1.0

Remove v4 development note

Update metadata.desktop (#74)

Inclusion of the Portuguese translation.

Work around the lack of onValueModified signal in QQC 1

SpinBox in QtQuick Controls 2 has a signal that is emitted when the
value is changed explicitly by the user. In QtQuick Controls 1, there is
no such a signal.

The most straightforward thing would be to switch to QQC2, but the
problem is that the SpinBox API in there is extremely stripped down. You
will need to re-invent the wheel to get basic functionality.

This fixes a bug where the update interval is reset to 1 unexpectedly.