PluginStore: add view for plugin store

resources/icons/plugins_default_icon.svg

src/app/commoncomponents/HeaderToggleSwitch.qml

src/app/commoncomponents/ResponsiveImage.qml

src/app/commoncomponents/SpinningAnimation.qml

src/app/constant/JamiStrings.qml

src/app/constant/JamiTheme.qml

src/app/mainview/components/CachedImage.qml

src/app/pluginadapter.cpp

src/app/pluginadapter.h

src/app/pluginlistmodel.cpp

src/app/pluginlistmodel.h

src/app/pluginstorelistmodel.cpp

src/app/pluginstorelistmodel.h

src/app/pluginversionmanager.cpp

src/app/pluginversionmanager.h

src/app/qmlregister.cpp

src/app/settingsview/SettingsView.qml

src/app/settingsview/components/InstallManuallyView.qml

src/app/settingsview/components/PluginAvailableDelagate.qml

src/app/settingsview/components/PluginItemDelegate.qml