[ui] size tweaks and new assets

gui/components/About.qml

gui/components/Footer.qml

gui/components/Locations.qml

gui/components/MainView.qml

gui/components/MaterialButton.qml

gui/components/MaterialRadioButton.qml

gui/components/MaterialRadioIndicator.qml

gui/components/Spinner.qml

gui/components/Splash.qml

gui/components/StatusBox.qml

gui/components/Systray.qml

gui/components/VPNState.qml

gui/components/WrappedRadioButton.qml

gui/gui.qrc

gui/main.qml

gui/resources/birds.svg

gui/resources/bridge.png

gui/resources/bridge.svg

gui/resources/ravens.svg

gui/themes/themes.js