Redesign WWSK Explorer

[emxsys]

Use the modernized worldwind-react-app as the basis of a new WWSK Explorer featuring:

• A streamlined and simplified UI (e.g., eliminate date/time and location widgets used in WorldWind Explorer)
• An editable code base (standalone forkable repo)
• Updated branding to look like an integrated component, e.g,. "[GeoServerLogo] Explorer"
• Branding link returns you back to the GeoServer admin page (not the WorldWind web site)

Tasks:

• Clone worldwind-react-app to worldwindlabs/wwsk-explorer
• Add WMS catalog support to load layers from GeoServer instance
• Add sort capability to layer list(s) (drag-n-drop)
• Add persistence support to remember layer configuration and markers between sessions

[emxsys]

@pdavidc @PJHogan The WWSK/GeoServer Explorer project could be a candidate for WorldWindLabs.