[Overall] Added some Qt5 CMake wrappers.
[Util] Use FindQtLibs().
[Util] Avoid reset() calls in Models.
[Util] Don't build util-x11 on Qt5.
[Util] Added missing include.
[Util] Require QtConcurrent for util-network.
[Util] QCoreApplication::translate() fixup for Qt5.
[Util] Added UrlOperator.
[Util] Use UrlOperator in VkAuthManager.
[Util] Don't depend on Quick in Gui.
[Util] Added missing include.
[Util] Proper storage paths for Qt5.
[Util] Qt5-compatible VkAuthManager.
[Util] Qt5-compatible WidthIconProvider.
[Util] Qt5-compatible PlotItem.