File list (Check if you may need any files):
PluginTest\debug\moc_widgetinterface.cpp
..........\main.cpp
..........\PluginTest.pro
..........\widget.cpp
..........\widget.h
WidgetPlugin\debug\moc_widgetinterface.cpp
............\.....\moc_widgetplugin.cpp
............\.....\WidgetPlugin.idb
............\.....\WidgetPlugin.intermediate.manifest
............\widgetinterface.cpp
............\widgetinterface.h
............\widgetplugin.cpp
............\widgetplugin.h
............\WidgetPlugin.pro
PluginTest\debug
..........\release
WidgetPlugin\debug
............\release
PluginTest
WidgetPlugin