- legacy Style and ThemePalette removed
- moved and deduplicated font definitions into `Theme` (unrelated to a
color palette)
- `Style.current.foo` -> `Theme.foo`
- `Style.current.fooColor` -> `Theme.palette.fooColor`
- upgrade the imports to 5.15
- removed some mode dead components
Fixes#16514
- causing too many regressions along the way
- most of our popups are already destroyed properly inside Popups.qml
- in general, a Popup (Dialog, Menu, etc.) can be manually destroyed iff
it had been created using `Component.createObject()`, otherwise it's gone
for good until restart
- manually enabled the destroy-on-close in verified cases
Fixes#10948 (maybe some other dupes)
Lukáš Tinkl
Patryk Osmaczko
Jonathan Rainville
Michal Iskierko
Alexandra Betouni
Alexandra Betouni