mousegen-0.4

• Fix run-time dependency on Batik, when not used;
• Add optional Zopfli PNG compression for Windows cursors.

Full Changelog: mousegen-0.3...mousegen-0.4

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Bonus: KDE Plasma Breeze (Plasma 6) cursors for Windows (w/ and w/o pointer shadow) as a demo mousegen could be used with other SVG cursor themes.