Update WhitePigeon.pro

added some backslashes
test.
WPPart::getExtendedInterval(.), WPPart::getReducedInterval(.) are now available.
We also can * and / a Fraction now.

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

Conflicts:
	OscilloscopeWindow.cpp
Plug-ins moved to plugins folder
before merging master
WPDefaultNoteModifier class
Merge branch 'master' of https://github.com/bg95/WhitePigeon into Pt-Cr

Conflicts:
	OscilloscopeWindow.cpp
	WhitePigeon.pro
	core/WPPipe.cpp