v3.1.0

• Bumps leaflet default version to 1.9.3
• Checks for lat and lon in osm_geocode with isset
• Adds min, max, step to inputs for zoom, minZoom, and maxZoom
• Obfuscates base tileurl with base64_encode in map-shortcode to deter crawlers
• Adds tooltipAnchor to geojson and marker shortcodes
• Default maxZoom is 19, down from 20
• Allows for comma-separated tile server subdomains, as opposed to 'abc' turning into 'a','b','c' automatically (i.e. you can now use something like "cache-1,cache2" as default subdomains)
• Adds new shortcodes: [leaflet-image-overlay] and [leaflet-video-overlay] (examples in the shortcode-helper page, or README.md)

Now to hibernate again...