settings: redesign plugin preferences view

src/commoncomponents/PreferenceItemDelegate.qml

src/commoncomponents/SettingParaCombobox.qml

src/constant/JamiTheme.qml

src/mainview/components/PluginHandlerPicker.qml

src/pluginadapter.cpp

src/pluginadapter.h

src/pluginlistpreferencemodel.cpp

src/preferenceitemlistmodel.cpp

src/preferenceitemlistmodel.h

src/settingsview/components/PluginItemDelegate.qml

src/settingsview/components/PluginListPreferencesView.qml

src/settingsview/components/PluginListSettingsView.qml