Fix seek min value check.
Add Antialiasing and SmoothPixmapTransform render hints for WKnobComposed since
it rotates raster images.
Revert "Normalize potmeter widget values to [0.0, 1.0] instead of [0.0, 127.0]."

This reverts commit 328d5958483ceb33cee74def6c947111182b5af0.
Revert "Revert "Normalize potmeter widget values to [0.0, 1.0] instead of [0.0, 127.0].""

This reverts commit 6fcd283cd80a34747320340ecc9a17b9b4b9606a.