account settings: add plugins

qml.qrc

src/constant/JamiStrings.qml

src/mainview/components/PluginHandlerItemDelegate.qml

src/mainview/components/PluginHandlerPicker.qml

src/pluginadapter.cpp

src/pluginadapter.h

src/pluginlistmodel.cpp

src/pluginlistmodel.h

src/pluginlistpreferencemodel.cpp

src/pluginlistpreferencemodel.h

src/preferenceitemlistmodel.cpp

src/preferenceitemlistmodel.h

src/settingsview/components/PluginItemDelegate.qml

src/settingsview/components/PluginListView.qml

src/settingsview/components/PluginPreferencesListView.qml

src/settingsview/components/PluginPreferencesView.qml

src/settingsview/components/PluginSettingsPage.qml