Qml localStorage initialization

* initialization (create table)
* user application name (identifier)
* add defaultValue argument to getSetting

Fix #66
use plugin label instead of plugin identifier in menu and search bar #71
fix a minor typing error

buttleofx/MainWindow.qml:48: ReferenceError: rs is not defined
hint window is resizable and its widgets too #70
remove useless splitview of paramTutteEditor
GraphEditor: right click on nodes use a window Item #73

still a problem when the toplevel window's size change
fix bug of display of paramButtleEditor
Quick view : add node doesn't remove existing nodes #58

+ remove useless code
Merge branch 'dev_menu' of github.com:buttleofx/ButtleOFX into develop