QLinkedList is gone from Qt6
The 1:1 port is std::list but we don't need iterator stability on
removal/insertion so just port to QList (one case to std::vector since
QList needs a copy constructor)
When the annotation is unchecked the previous mouse mode is restored.
The slot slotMouseNormalToggled is changed back to its original version
of slotSetMouseNormal given that we needed to pass the checked state
only to detach the annotations, and we do it in the lambda now.
BUG: 398108
BUG: 437377
FIXED-IN: 21.08
It's still not perfect because it probably won't show the signature
since signatures "usually" go to the bottom of the page and we're only
focusing on that page, which means the beginning which depending on zoom
settings may very well not include the signature, but at least it's
closer
Source files are no longer separated by UI and non-UI and similar,
but only by their build target.
* ui/ -> part/
* Move all source files from conf/ to part/
* Keep config skeleton definitions in conf/, needed for the mobile target too
* Move editdrawingtooldialogtest.h from conf/autotests/ to autotests/
* ui/data/icons/ -> icons/
* Move /part.cpp, /part.rc and similar files to part/
* Adapt include paths in source files
* Adapt CMakeLists.txt files (in / and in subdirectories)
* Adapt /Messages.sh
