Log Message:
graphics/kvantum: update to 0.18.0

-Use PE_FrameStatusBarItem with Qt ≥ 5.13.0 and return from it.
-Made toolbars unmovable by default.
-Added some effects to the labels of Kvantum Manager's About dialog.
-Don't let the width of a push button that has text be smaller than 80px
(although the minimum width may be greater because it depends on the font).
-Replace text tabs with spaces when calculating label sizes (because text tabs
aren't expanded when labels are drawn).
-Always draw the tab text in a single line.
-Horizontally smaller menus when they have accelerators.
-Respect the key "no_inactiveness" with all widgets.
-Get tooltip shadow dimensions only once if compositing is available.
-Draw the icon of the menubar item instead of its text if it's given.
-Fixed the field growth policy of centered form layouts.
-A better window dragging code (x11drag) with Qt ≥ 5.15, that works under X11
and Wayland alike by calling the window manager.
-Added an option (to Kvantum Manager) for dragging windows from buttons.
-Considered a rare case of window type change for window translucency and
dragging.
-Removed the scroll jump workaround. It interfered with animations and cluttered
the code to partially compensate for Qt's scroll jumps that appeared with mouse
gestures.