[Core] Wrap PlotItem inclusion in WITH_QWT as well.
[ToG] Added Textogroose plugin stubs.
[Qrosp] InvokeMethod() shouldn't be const.
[Interfaces] Clarified ILyricsFinder docs.
[Qrosp] Code style fixes.
[Interfaces] IScript::{Add,Get}QObject() methods.
[Interfaces] IScript::Execute() and AddQObject() clarifications.
[Qrosp] Execute the script after objects are added.