ParamInt and ParamDouble are slider in QML.

And delete paramSlider !
Need to fix that slider for paramInt can give float...
Merge branch 'develop' of github.com:buttleofx/ButtleOFX into develop

Conflicts:
	buttleofx/gui/paramEditor/qml/ParamDouble.qml
	buttleofx/gui/paramEditor/qml/paramSlider.qml