The new TriStateAction class is an improvement of the old one in the
sense that:
1. Have public method to set states.
2. Can connect to the usual Qt slots.
3. Draws checkbox at the correct offset (where QAction draws) in menu
and better handling of mouse clicking and keyboard navigating.
1. Use FeatureSummary module to show configuration results.
2. Invert option()/find_package() relationship: instead of
calling find_package(... REQUIRED) when option is set, rely on optional
find package call and PackageName_FOUND variable.
3. Refactor handling options that result in simple preprocessor defines
(actually copy the snippet from libtorrent) so that everything is done
in a single function call.
4. Populate target properties in order to get rid of
include_directories() calls.
Fix LineEdit widget size issues
Up-scale the icons on statusbar
Up-scale the icons in options dialog. Closes#7729.
Fix small icons in cookie manager
Fix progress bar height
Fix small icons in confirm delete dialog
Fix small icons in options dialog
Fix small images in about dialog
Created new file src/gui/macutilities.mm, moved code from mainwindow.cpp and torrentcontentmodel.cpp that used the Objective C runtime into it and converted it to actual Objective C. Rewrote pixmapForExtension() so that it doesn't call into private Qt functions.
Qt resource is innitialized by a static object constructor (see
https://wiki.qt.io/QtResources). When we put resources into a static
library, the linker removes that static objects and thus the resources
themselves. To correct that we append resources to the main executable
sources list. This is done via custom function qbt_target_sources which
knows where to read the executable' name.
