I change something.
Merge branch 'master' of https://github.com/bg95/WhitePigeon

Conflicts:
	WPScore/WPLib.h
	WPScore/WPMultinote.cpp
	WPScore/WPMultinote.h
	WPScore/WPNote.cpp
	WPScore/WPNote.h
	WPScore/WPProperty.cpp
	WPScore/WPProperty.h
	WhitePigeon.pro
	core/WPSynthesizer.h
I made some changes. WPScore becomes a library.
But I have no idea of WPSlur. It seems that we must write all the functions defined in WPModifier(?).
Just FYI, to compile a plugin, use the command:
g++ WPSlur.cpp -o  libWPSlur.so -fPIC -shared -I /usr/include/qt5/QtCore -I /usr/include/qt5/QtMultimedia -I /usr/include/qt5 -I ./.. -I ./../include -L ./../lib -lWPScore -g