[Core] add qt5-compatibility to LC_EXPORT_PLUGIN macros
[AdvancedNotifications] add Qt5-compatibility
Revert "[Core] add qt5-compatibility to LC_EXPORT_PLUGIN macros"

This reverts commit 9be829c5dfae1164e83b012f9fe942cd3ae517e0.
[Core]  LC_PLUGIN_EXPORT now Qt5-compatible
[Core] remove unused parameters
[Util] fix using of beginResetModel()
[Util] use QWidget::windowHandle instead of QWindow
[AN] style fix