Shortened GPL header in QML files

src/qml/+android/MainMenuMobile.qml

src/qml/DialogLoader.qml

src/qml/MainMenu.qml

src/qml/MainScore.qml

src/qml/MainWindow.qml

src/qml/NootkaLabel.qml

src/qml/TtoolBar.qml

src/qml/about/AboutPage.qml

src/qml/about/AuthorsPage.qml

src/qml/about/ChangesPage.qml

src/qml/about/DonorsPage.qml

src/qml/about/HelpPage.qml

src/qml/about/LicensePage.qml

src/qml/about/QtPage.qml

src/qml/about/SupportPage.qml

src/qml/about/TaboutNootka.qml

src/qml/about/TextBackground.qml

src/qml/instruments/Guitar.qml

src/qml/instruments/Instrument.qml

src/qml/score/AccidControl.qml