custom extension options

Straight from the readme / changelog:

= 0.9.6 =

• Tweak: Added custom extension options via filter hook (ui_leaflet_add_extension_options), exposed in JS as global object ui_leaflet_extension_options

= 0.9.5 =

• Tweak: Added marker extraction routine for the main shortcode (in preparation for future versions)
• Tweak: Use filter hook to enforce assets loading (_ui_leaflet_load_assets)
• Added experimental custom icons (SVG / CSS)
• Several bugfixes

Version 0.9.4 (bugfixes + extension loading + better icon classes)

Did some bugfixing, esp. SSL-related, because auto-detection of the current position of the user simply fails in Chromium-based browsers, if the current page is NOT completely SSL-protected. Also uses a different approach towards the usage of the Geolocation API (its using it directly, based upon a code snippet / example by MapQuest, vs. the regular "Locate" feature by LeafLet.js).

Also includes two filters to load additional leaflet plugins (extensions), as well as improved icon classes plus a bit of template glue for improved asset loading.

v0.8 (added Geocoder control + latest Leaflet.js)

Added a Geocoder Control, which can be enabled using the shortcode parameter "use_search" (set to "true", "yes" or "1" - check is for !empty). Also updated to the latest Leaflet.js release, ie. v1.6

Version 0.5.1 (updated Readme)

Forgot to update the readme file. Now includes notes on filter hooks and using external hosting choices for the Leaflet.js library.

Version 0.5 (Leaflet.js 1.3)

Updated the Leaflet.js library to v1.3. Added the latest changes to the plugin code.