This (partially) reverts commit 127bbdf653.
Only incorrect changes from Kirigami.Units.largeSpacing to
Kirigami.Units.gridUnit are reverted. Only Plasma.Units were buggy.
Search and replace all the occurrences of Svg/FrameSvgItem/SvgItem
to their new implementation from KSvg.
Changes only namespace, API is the same
See also:
https://invent.kde.org/frameworks/ksvg/-/issues/1