plugin: implement view to change preference

jami-qt.pro

src/mainapplication.cpp

src/mainview/components/MediaHandlerItemDelegate.qml

src/mediahandleradapter.cpp

src/pluginitemlistmodel.cpp

src/pluginitemlistmodel.h

src/pluginlistpreferencemodel.cpp

src/pluginlistpreferencemodel.h

src/preferenceitemlistmodel.cpp

src/preferenceitemlistmodel.h

src/settingsview/components/PluginItemDelegate.qml

src/settingsview/components/PluginListPreferencesView.qml

src/settingsview/components/PluginListSettingsView.qml

src/settingsview/components/PluginSettingsPage.qml

src/settingsview/components/PreferenceItemDelegate.qml